no, that's impossible. listen, somehow they've gotten that gps information. they've gotten into the phones. but that doesn't explain how they knew who to rob. look, this is a two-part problem, okay? part one: how do they know who to rob? and part two: how do they know where the victims are? the phone is the key to part two-- locating victims. part one: how they know who owns what, i still can't tell you. but you can be positive that all the families will have it in common. alan: hey, charlie, you seen my cell phone? i been looking all over for it, i can't find... what are you doing with it? we'll put it back together. you can't use one of your own? larry: well, i refused to allow the small, quiet moments of my life to be invaded by these devices of distraction. which means you don't have one? and i need mine. look, charlie, i'm not a homebound retiree anymore. i happen to be starting a new business. and having a cell phone might come in handy. right? look, you'll have it back in one hour. dad, we need to look at your gps chip. what do you need to do that for?

every new phone comes embedded with this tiny chip that acts as a global positioning receiver. and it's my theory that these home-invasion robbers are using them to track their victims. how would they do it? well, a cell phone's essentially a radio. whenever it's on, it's sending radio signals to let cell towers know where the phone is so a person can move from one cell zone to another without losing a call. at the same time, the gps chip receives signals from outer space, specifically, from at least three geosynchronous satellites. using the geometric method called "three-dimensional trilateration," the gps chip uses the signals from the satellites to calculate its exact location on earth. the data generated can be used by police, roadside assistance, emergency services, tracking truck fleets-- and even lets parents keep tabs on their teenage children. ah, it's too "big brother" for me. i'll stick with my rotary dial-up. but intercepting these signals is really beyond the grasp of most criminals. alan: if all my years of working

at urban infrastructure has taught me anything, it's that there's always somebody who gets into the system. megan: charlie was right. three days on the button. married couple, 74 and 77 years old. from the evidence, it looks like the man struggled with the robbers. don: yeah, they beat him to death, they got the woman over here. they strangled her. doesn't look like they put up much of a fight. megan: they're acting more frequently, and killing more readily. ice breakers frost. a great tasting mint core, frosted in powerful cooling crystals. ice breakers frost. feel the frost. real restaurant style flavors like loaded potato skins. hey, funky party people. are we having fun? [ male announcer ] any more "restaurant" and they'd come with an annoying waitress. new snackers from ♪ hot pockets

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country and the world. i am crossing my fingers that this has to be the bullet from the carjacking. david: not a lot of bullets lying around brentwood. no, it's more of a slash-your-throat kind of neighborhood. well, we're running the slug through the atf bullet trap database, hoping to match the gun it was fired from to a previous crime. we need this lead. and after eight hits, they're going to think they're invincible. that we can't catch them. they're going to be more reckless, more dangerous. bingo. larry: yeah, i heard on the radio-- two more people killed by these robbers don is trying to catch. yeah. it's bad. and the data mining is not yielding any connections you can work with? well, it's hard to say. you know, one commonality that the analysis keeps highlighting is cell phones. but, you know, everyone has cell phones. then there's a second commonality, that has no defined value. the algorithm keeps pointing out that the families all have rare, collectible items.

and all were insured. you really should get this program to amita. she is the best coder we've got. i don't think this is where the problem is. and... amita's off chilling with penfield. well, he is a brilliant mathematician and, i assume, a sparkling conversationalist. are you serious? oh, you're great. you're just another member of the penfield fan club. right? well, i do understand his analysis of the eppes convergence was a bit pointed. i'll admit, he's a bright fellow. he's got all sorts of insight. but he's so full of himself. he's so annoyingly confident. "certainly in extending the calculation for s "to the infinite unitary group, "it would be obvious to anyone "that my genius would mandate-- "upon my death-- "the inclusion of my brain in the smithsonian." i would actually prefer someone take my brain on a road trip like they did with einstein's. but... hey, charlie. hello. charlie, marshall and i

went to your office looking for you, and we kind of saw what was on the chalkboard. ( mouths words ) penfield: yeah, you had a problem that was of interest to me because it relates to my main field-set theory. oh, well... this is it, isn't it? this is the same thing right here. could be. why? marshall's new research at princeton is inset theory, in something he calls "deep current" sets. what are those? chalk. connections between groups that are hard to detect, but that affect all the other sets. kind of like how currents beneath the ocean surface can influence the weather patterns in the atmosphere. there's something underneath we can't see. things that seem to have no connection are all linked by a common factor. marshall, have you developed

methods of analysis to help you define the unidentified connections? oh, yeah, sure. even if i can't tell you where the deep current is, i can tell you were to look. megan: but, charlie, all eight families have different insurance companies. sure, but the data mining found that there's a powerful connection between the victims, and it's not something we can see. it's an unseen set, a deep current set. i'm sure that means something. right. the victims' families all had high-end valuables, like the dirk van erp lamp that you guys tracked down, right? right, that the robbers all knew about in advance. the victims' families all had different insurance companies, but my analysis suggests that the insurance companies have something in common. so like what? well, apparently, when covering rare, high-cost items, insurance companies often purchase a rider, a backup policy from another firm. yeah, insurance riders, of course... which wouldn't show up on a criminal report, s because the customers don't even know they have them! colby, charlie's got a good idea-- check out if any

of the insurance carriers bought riders from the same firm. charlie: if i'm right, you'll find a company common to several victims. and someone with access to that company's list of clients. and would know how to hack into cell phone signals. megan, get a list of local employees with criminal records from the wireless companies. all right? i have that. i'm impressed. thank you. don, i already looked at three of them. they used the same underwriter. it's a btl, limited, so i'm gonna check, see if i can get employee lists. don: good. great. now, compare that list to megan's list, and maybe we'll find one guy on both. no, we're looking for two guys, mr. brown, and mr. gray. remember, one will know cell phones, one's gonna know insurance. this is the fbi's version of data mining, finding links the old-fashioned way. oh, yeah, by hand and by luck. here we go, herbert quilty, service tech for vertech wireless. two years ago, pled guilty to selling stolen cell phones, served three months in county gail. what's his link to the insurance company? same time as quilty was in jail, a guy named thomas maynard was serving weekends on a dui conviction,

maynard was a supervisor at btl underwriters. how did roley put it? "one dresses better than my lawyer, right. and one is a total geek." freeze! hands behind your head! down on your knees! down! herbert quilty, you're under arrest for murder. i had that wine at morton's last week. fbi! get on the ground! on your knees! down! on your knees! hands behind your back, maynard! you're working with some nasty dudes, maynard. where'd you meet guys like that? weekend lockup seems a bit tame for stone killers. no evidence connects me to any crimes. can't control these guys, can you? thought you were getting into the robbery business. switched the game on you, didn't they?

you set it up so they could stalk their victims, in their homes, in their cars. that puts you right in the middle of things. walter gordon. his friends call him "demento." leader of a san fernando valley skinhead gang. hmm? never seen him before in my life. yes, you have. what happens to you now? what do you think he's gonna do to you the next time the two of you run into each other? and what about your family? if you're locked up, and he's out there? they weren't supposed to hurt anyone. that's all on them. i picked people from the company files. quilty rigged the phones. with gps to the node signal. maynard: demento's crazy. i tried to keep him to a schedule, but he wanted to move faster and faster

he decided to pull these carjackings. said he wanted to be known for selling expensive wheels. nice timing on the photo. david: forensics matched the bullet we found in brentwood to one shot through the head of a fast food worker in tarzana about two years ago. witness in that case id'd walter gordon, aka demento. megan: what i don't understand is how did quilty's phone let the robbers know where track victims were? well... quilty must have put a sniffer on a node. a node is something that takes all the calls coming into a cell tower and then relays those signals to where they're going. a sniffer is an electronic device that detects specific calls, then sends that signal to a phone the robbers must have. and you think quilty's phone could do that? i think so. all he needed was access to the cell towers. because he worked at a wireless company, he had that. charlie: and the gear required, well, he could buy that at any electronics store, couldn't he? all right, so maynard gave quilty phone numbers of people who owned valuable things. right, and quilty had his sniffer search for those numbers. when those signals came in, the locations went to the phone that he gave the robbers.

they could follow victims, move in as they arrived home. walter gordon, aka demento, has no known address. lapd's been looking for him since the tarzana killing. okay, so maynard and quilty set up gordon with phone numbers of potential victims. see if they picked any new victims. i mean, if we can't find gordon, let's find out where he's going.

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come on, take me to your home. ( loading clip ) demento: there's the volvo. skinhead: this family will not know what hit them. ( tires screeching ) i got the driver, you get the girl! out of the damn car! get out of the car now! get out of the car! drop the gun! drop it! ( agents all yelling ) don't move! get your hands behind your back!

( skinhead grunts ) ( grunts ) get him up. ow! what the hell is that? megan: shut up, can't you see the baby's sleeping? charlie: marshall. eppesy. i just thought you might like to know that your insight on the subset commonality helped the fbi catch three murderers. wow. that's, uh... that's, that's great. so, thank you for your help. you're welcome. i hope you understand, i didn't work on the eppes convergence because of you. i did because, uh... well, because it's great math. you know, back at princeton, you were always the guy with the deep ideas. this one just fascinated me. well, i have to admit... your work shows tremendous insight.

thanks. though i've taken another look at your analysis oh, no, i know that tone. and i think i've found a way to address the flaw that you've identified. that's the basic idea. that negates the whole need for the flawed section, then. how about that? great professor charlie eppes has done it again. now, that's hokum. this approach was only apparent because of your work. so i'm going to call this the penfield variation. ( laughs ) great. way to make me feel like a real ass. ( chuckles ) ( knock at door ) alan: door's open. hi, mr. eppes.

hi. hi. charlie's supposed to come with us to a seminar. oh, he's out in the garage. hey, charlie, your friends... here he comes. been out in the garage all day. hey, guys, you know what? go on without me-- maybe i'll catch up with you later, 'cause i'm a little caught up with something right now what are you working on? a unified theory of the neural network in higher cognitive functions. larry: the math of the brain. i'd better stick to it, too. it might take me a while... say, several decades. attaboy. yeah, what is it they say? "the journey is more important than the destination?" so true. you're doing a jigsaw puzzle. oh, yeah, it's 5,000 pieces. my wife used to do them all the time. so what do you say you skip the seminar, and we'll order in some pizza? i love jigsaw puzzles. and i love pizza. all right.

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