a jeweler chooses certain types of beads then strings them in a particular pattern according to his own unique, personal style, just like im senders will exhibit their own styles, patterns of speech which are unique to them. so, then we just compare them. yeah, to the transcripts of the volunteers for this "parents stop predators" group. look, if the killer is in that group, he will be betrayed by his own chat. amita. hey. hi. um, have you seen charlie? i-i have the transcripts from the killer's latest chat. he's working in larry's office. larry's at a symposium. and he thought he could concentrate better there. oh, he's got you working on this, too? well, my experience with asymptotic combinatorics comes in handy. sounds like everything you need for a good working relationship. charlie and i work well together. well, that must be nice. you gonna miss him, aren't you? yeah, a little more than i think i originally thought i would. well, he's coming back. yeah, he is. and i have a telescope now.

(laughs) you know, i'm actually going that way. i'll walk with you. (laughing): okay, thank you. sure. charlie: i need to speak with dr. york concerning lawrence fleinhardt. f-l-e-i... oh, you know him? okay, well, then i guess you're the person i need to be speaking to. um, i've known professor fleinhardt for approximately 17 years, and i'll be the first to admit he's an eccentric. i'm aware that that's your concern. yeah, but he's brilliant. he's the kindest, most decent person i know. yes. i am, i am personally vouching for him, yes. well, i appreciate that. uh, yeah, yeah. yeah, i guess that is all i have to say.

thank you. (mouthing) hey. so, got something? yeah, i did what i said i was going to do. i compared the killer's messaging patterns against our parents stop predators group and i've isolated a near match within an error margin of five percent. all right, so who? according to my math, brendan mccrary. no, no, that's not possible. he's already alibied for two of the murders. yeah, but charlie's saying he found a near match. you know they say people and their pets start to look alike? same thing happens in family dynamics. one member of a family will start to think and speak alike. what, the family? the wife did go off on you pretty good. yeah, but going off isn't what i'm talking about, 'cause that's too explosive. this kind of rage is, is calculated carefully. all right, well, if you don't think it's the wife, there's only one survivor left. all right, matt, this is from your laptop.

list of sexual predators, these are chat room conversations. he says you downloaded it from my computer. is that true? four of the names from your father's list were murdered. now, he didn't do it. you're the only other source. you going to tell me what i want to know? agent epps asked you a question, son. i didn't kill anyone. who did? hey, look, it makes sense that you'd want to get back at people like that-- what happened with your sister. it's normal, it's natural. i would, too. but that makes you just like them, right? is that what you really want to be? no. sweetie... i didn't know they were going to get hurt, i swear. tell them what they need to know. i met this person in a chat room for families of victims of sexual predators. i didn't know his name or anything about him. all i know is that he listened. honey,

if you were having problems, why didn't you come to us? what were you going to do? matt! oh, seriously, dad, you're too busy with your catch the creep group. and you? you don't even come out of your room half the day except to go into katie's bedroom to look around. you don't think i see? i loved katie. losing her sucked. but i didn't just lose her. i lost you, too. this person you said you met, what'd you talk about? my dad's group, mostly. how useless they are getting these guys into counseling. how counseling doesn't do anything. you gave him the names, right? it's... i didn't mean for any of this to happen. (sniffles) i'm sorry. larry: hey, charles. i thought you should know. yeah? i heard from nasa. uh-huh? i'm back on the mission. oh, that's... that is great.

congratulations. well, apparently, someone at the nsa did some arm twisting. oh, well, they're the experts, off the record. well, on the record... thank you very much. i didn't do anything... aside from making them see the error of their ways. consider it my contribution to national security. (laughs): what, you think having me off planet improves our security? i didn't say it. well, i know you don't want me to go. and therein lies the nobility of what you did. what i did was repay a debt. you don't remember this, do you? but, uh, when i was a 14-year-old kid at princeton... when we first met, do you remember what you said to me? as i recall, i said many things. you said... that you wanted to see me safely launched into the academic firmament. now it's your turn. listen, just so you know,

it's always harder on the mentor than it is on the student. colby: i traced the username of the person that matt mccrary talked to in that chatroom. it was a dead end. the guy keeps covering his tracks, right? how about you, you got anything? i keep going over my interview notes. matt mccrary had a conversation with the killer talking about how useless counseling is for guys like these. sounds an awful lot like my conversation with elaine tillman. the first victim's wife? you think she had something to do with this? she told me her husband swore he would never touch their kids. what, she lying? we never did find his video confession online, and i think i know why. because she didn't need a confession. right, 'cause she already knew. all right, so going with that theory, i get why she kills her husband, but what about the rest of the guys? the notification letter brendan mccrary sent to the tillmans must've been the trigger that just pushed her over the edge, and then she met matt online. and she knew that there were all these other men out there just like her husband. we know scott tillman

taught computer science in high school, so she could've learned what she needed to know from him. architect of his own demise.

man on radio: mission is a go. you are good to go. so, have you made your decision yet? yeah, i think so. this year, more than 27,000 children will be diagnosed with a life-threatening

medical condition. their wishes are waiting to come true. you can make it happen. find out how today at wish.org. [ flippers slapping ] [ jet plane passing ] [ swings squeaking ] [ squeaking ] [ creaking ] [ rock music playing ] from exploring europe to conquering x-camp... girl scouts today offers so many incredible opportunities, the only problem you'll have is deciding what to do. so... ♪ yeah, yeah, yeah, whoo! ♪ over the past three months, she's contacted

a half dozen real estate agencies. she did say her and her husband were looking to buy a bigger house. she used a different name to contact the real estate agent, make the appointment. all right, where is she? two hours ago, she dropped the kids off with a neighbor, said her mom was sick, had to take her to the hospital. uh, no, she's lined up her next victim. all right, how many houses are in here? almost 100. yeah, at least. all right, let's get it up to charlie. so i mapped all the locations of the houses on elaine tillman's list. and assuming she's sticking to live uploads, she's gonna need a strong wifi connection. all right, i don't want to go to the wrong house again, so... doesn't even matter because this time we'll know where she's transmitting from. yeah, and how's that? when i did my real estate analysis, i was looking at wifi connectivity. in fact, i had your techs cross check the database of broadband users in these areas against owners of wireless routers. that sounds like a lot of houses. not where we're looking. because, remember, she was choosing houses in jessica's law hot zones. overlaying those hot zones over our map of houses and factoring in for wifi connectivity, i've isolated five locations

where she'll likely strike next. all right, i'm gonna get lapd into those areas. as soon as we find her car, we're gonna move in. there's elaine tillman's car. house is around the corner. 2152 floresta. and lapd has the perimeter? let's take the house. (man yells) what do you want from me?! everything! fbi! fbi! fbi! fbi! one more step and he's dead! elaine, nobody's doing anything. nobody's gonna move until you and i talk. about what? you know why i'm here. you know what i have to do. i know what happened. i know your husband hurt your daughter. he lied to me. he promised he'd never touch susan! okay, i want you to think about your kids. your children do not want you to do this. this man never touched your daughter.

what about the other daughters?! i have to stop them! no! what difference does it make? if i kill him or not, they're gonna shoot me anyway. elaine, no one's gonna shoot you. listen to me, we have proof. we have his words on his computer. we know why he came here. he's not walking out of here a free man. put down that knife and he's going to jail. and there's nothing you can do to him that isn't going to be worse in there. (crying): just don't... just... okay.

you okay? yeah. i thought for sure she was gonna kill me. thank you. shut up. (chuckling) all right, larry, here you go. i got you a few extras in case you run into any, uh, i don't know, aliens or something. my colleagues in space salute you. it'll be reassuring to know that we have an fbi presence out there in orbit. how do you know we don't already? that's right. professor, it's often been confusing... it's always been real, man. take care, okay? larry: see ya. colby: i second that, fleinhardt. i'll be looking up for you, bud. take care. larry, be careful up there, all right? yeah. see you around, don. i'll miss you. professor fleinhardt.

well, if you ever need to call... i'll just put it on the nsa's tab. i'll walk you outside. take care now. see ya. (voice breaking): well, i guess the next time i see you, you'll be in your space suit. isaac newton had his apple. but it took you falling into my life to make me see the world anew. even i became new. and how we see ourselves changes how we see the world. even from space.

just be careful. well, i've got to go. someone's waiting. is that buzz aldrin? i think nasa figured i'd need help finding my way. bye, larry. (giggles) ♪ she packed my bags last night, pre-flight ♪ ♪ zero hour, 9:00 a.m. ♪ and i'm gonna be high as a kite by then ♪ (launch announcer speaking indistinctly) i have goose bumps. (nervous giggling): me, too. hey, he'd better wear one of our hats on tv, right?

but how's he gonna get the hat over the pressure suit, though? fleinhardt in a pressure suit. that's a visual i don't need. aw... i can imagine! you're awfully quiet. it's just not every day you get to see your friend live out his dream. it's not every friend that gets to make it happen. t-minus 30 seconds. charlie: hey, whoa, dad! all right, you're... come on! you're gonna miss it. alan! hold the countdown, i got the drinks. wait, what's the deal, no champagne? well, in honor of larry, and given his propensity for white food, i figured milk is the most appropriate. ♪ 'till touchdown brings me 'round again to find i'm... ♪ a toast to larry. yes, may the orbit rise with you. and may the solar winds be at your back. (launch announcer speaking indistinctly) i think you've been hanging out with us nerds for too long. wait, wait, here we go. announcer: and minus-10... all: nine, eight... seven, six... five, four... three, two, one!

announcer: and liftoff. ♪ i'm not the man they think i am at all, oh, no, no, no ♪ godspeed, larry fleinhardt. ♪ i'm a rocket man... captioning sponsored by cbs paramount network television and brought to you by toyota. moving forward. choose any direction as long as it's moving forward.

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[ woman: ] my father taught me a lot about life... without ever saying a word. when i was a little girl my friends were all just like me. his never were. hello, hello. didn't you bring them? yours? i thought you were going to. no, i brought them last time. you're right! ha ha ha! i forgot. alright, alright. [ woman: ] i used to wonder, why would a jew, a christian, and a muslim ever get together? it was him!it w! and then, i finally got it. they had a lot more in common than donuts. ♪ love can build a bridge. ♪ ♪ oh, love and only love. ♪ ♪ between your heart and mine. ♪