david. i'm coming. come on. (doorbell rings) yeah, i'm coming. hey, larry. alan. hey, is-is charles here? uh, no. good. that's good. that's very good. can i get you something? hey, look at this. why, to graduate princeton at 16! i was good, but... it took me till the more normal age of 19. yeah, well, in that first year, we heard an awful lot about professor fleinhardt. yeah. you know, he spent half the time

trying to prove the t.a.'s thesis was wrong. well, charlie was never afraid to give his opinion. yeah, well, of course, charles was right. is there something bothering you, larry? charles is having trouble understanding why i didn't ask for his help on this recent paper that i published. oh? yeah. i mean, it's not that i don't value his input. i mean, you know that i do. but? alan, charles's work at the fbi increasingly consumes him. yeah, we know that, but... in my field, dependence on any one person, that can spell the end of a career. and i'm just not ready to go. not yet. you know, there's also something called pride, and i've never found that a great justification for anything. that was sog. bank manager inadvertently tipped carter off that subpoenas are being served on his accounts. well, is that your way of saying he's gone?

yeah, he knows we're on to him. all right, if carter's on the run, then he has access to all kinds of fake ids, passports. yeah, but we have his money. just let me ask you this: you think he's the type of guy who's gonna hang around for like one last score? i'd buy that. he probably has the name of every fbi informant working against the chinese. we have the consulate covered, so there's no way he's gonna make contact there. i mean, it could be pre-arranged, right? look, he's meeting her on a regular basis. yeah, but that was at the apartment. yeah, but at some point, his handlers got to want to meet him, they got to want to check him out. and there's no way she's gonna bring them all to that apartment. you know, carter's pda had a bunch of meetings on company time that the bureau couldn't explain. yeah, you got the times? they're all like 11:00 to 1:00. well, you have, uh, the locations of the meets here? they're spread throughout the city. you know what, do me a favor, e-mail them to charlie, maybe he can come up with something. megan: we're worried that carter's going to try and sell whatever information he's got before he leaves the country. and these appointments from carter's pda are meetings between him and the chinese? we think so.

hmm... well, a lot of these addresses are within a couple miles of the fbi. now i've learned from the nsa that operatives will often schedule meeting places, like, months in advance. they're given a list. and no two meeting places are ever the same. okay, so we can then logically assume that the meeting place is somewhere inside this circle? right. it's a classic combinatorial optimization problem. and no one is better at combinatorics than you. who else could be? it's simply a question of branching and bounding. branching and bounding? so you're trying to predict how a tree is going to branch. and you know where six of the branches' meeting places already are. now where will that seventh branch-- carter's next meeting place-- be? certain factors can help us eliminate potential branches. like, we know that carter has to make a clean and fast getaway. see, these meetings are taking place in areas that are zoned for businesses with open courtyards, with promenades, with multiple entrances and exits. one was pershing square... and one was the staples center.

they're both close to the freeway, easy getaways. right, and so, by running an algorithm that analyzes the features of the existing meeting places to find key variables, then by applying a branching and bounding algorithm, we can hopefully identify where carter's next meeting place will be. (walkie talkie chirps) david: sinclair for eppes. go for eppes. sog's got nothing on the other locations charlie's listed. all right, just give it time, you know? i thought carter took all of his meetings during the daytime. that's why it's called probability. wait, hold on. yeah, i got eyes on him. david: hey, that's chen, the guy from the consulate. i don't know, he looks pretty calm. i don't think he knows we're on him. don, carter just passed him something. don: all right, let's follow him. don't bumper lock. bravo team take chen outside the park. we got carter.

all right, he's turning right onto broadway. stay back, everybody. wait for me, wait for me. copy that, david? copy that. all right, wait. he's going eastbound into the second street tunnel. david, let's box him in. (siren blares) sinclair to adam 23. i want you to lock up the east end of the second street tunnel. shut it down right now. (sirens blare) get your hands out of the windows! get your hands out of the windows now! driver, keep your hands out of the window, open the door and step toward my voice. nice and easy. just step toward my voice. dwayne, you don't want us pulling you out of that car. come on. david.

come on. you've got to be kidding me. colby was right, this guy is good. here, catch.

[ 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. ♪ chen isn't talking to anyone, and the state department's

certainly not going to lean on him. they've got bigger stakes with china. we've got surveillance on the airports, public and private. border patrol has a copy of carter's profile. guy works in intelligence ten years, he's not taking public transportation. don, if carter has an exit plan, colby is our best chance at figuring it out. yeah, well, colby's not on the case. i mean, i can't trust him. whatever happened between him and carter blurred his judgment. why don't you let david try and call him? i already tried. got his voicemail. guy's got something to say to me, he knows where i am. guess you got to keep the boat in the divorce settlement. do me a favor and untie that bow line. for a guy who loves the ocean, i never could understand why you chose to go to the desert. if i hadn't, you'd be dead. they took my badge, my gun. then there's nothing keeping you here, right?

look, i got something to sell that'd be enough for the both of us. yeah, and how many people are gonna die this time? you killed two innocent witnesses. and michelle kim? when i met her, i must've looked like a deer caught in the headlights. i mean, this girl, she was all over me. at first, it was just drinks and sex. yeah, and then what? i was only giving her useless information. and every dime of it went to my kid. no, the information you sold her killed two federal witnesses. a murderer went free because of it. she blackmailed me. she told me if i didn't steal high-level information, she would expose me. so, what, you killed her to save your ass? i saved your ass once. you remember? what help am i to my son if i'm in prison?

there was nothing i could do. i didn't have any other choice. you got a choice now. you can come in with me. it's not gonna make anything right, but it might just give your kid one chance at least to forgive his father. what if i don't? huh? you were one of the bravest soldiers i ever knew, dwayne. (yells) no! granger. granger... come on, give me the tape. give me the tape. you gonna kill me? go ahead, man. go ahead.

(distant sirens approaching) put it down! i can't believe you did this to me! drop that gun! put it down! drop it! no. no, dwayne... no, you did it to yourself. drop that gun! put it down! hands up! now! hands up! you know, i've never been in combat. but i've been in my share of fire fights and you know what scares the hell out of me?

it's not dying. it's letting my guys down. you know? losing trust. you do it again, you're going to jail. still trying to untie yourself. there's over 70 precise moves with this. well, they don't call it the world's toughest brain teaser for nothing. you know, i used to be able to do these in under two minutes. now, it's over six. oh, that's still pretty good. yeah. it's not my best. neither was hiring stromsborg as my collaborator. larry, we've discussed this, stromsborg's good. yeah, but he's not the best. what i forgot to keep in mind was the paper meant nothing. you see, it was all about the work.

or should've been. speaking of work, i could still use your help... if it's not too late. larry... i have a confession to make. yeah? i already read the paper. oh. and? you want me to be honest with you? no, i don't. i want to remain a blithering idiot. yes, of course, i want your honesty. larry... i never want to lose you as a friend. and you never shall. it's a work of genius. okay, now there. was that so hard? but... but... it would have benefited from the work of two geniuses. yeah. simon and garfunkel, perhaps? okay. fine, yes. as long as i'm simon. well, charles, ever the pragmatist.

captioning sponsored by cbs paramount network television and presented by toyota. moving forward. choose any direction as long as it's moving forward. captioned by media access group at wgbh access.wgbh.org one thing that makes our day when we're on the field is watching lauren get up to bat. our daughter loves baseball. and we tried to get her on some teams, and there were some coaches that would include her but she just never felt right about it. hitting the ball and then making the other kids wait, just wasn't her idea of what baseball was. we thought she would just have to settle for being a fan;

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woman: in 1990, in severn, maryland, the daughter of a clergyman was discovered by a music industry insider while pumping gas at a service station.

the odds of her getting signed and spending 11 weeks at #1 on the u.s. singles charts? 1 in 19 million. the odds of this former church choir singer going on to sell 40 million records? 1 in 15 million. the odds of the same woman winning 6 grammy awards and starring in two broadway plays? 1 in 75 million. the odds of this musician and performer having a child diagnosed with autism? 1 in 150. i'm toni braxton, and i encourage you to learn the signs of autism at autismspeaks.org. early diagnosis can make a lifetime of difference. one thing that makes our day when we're on the field is watching lauren get up to bat. our daughter loves baseball. and we tried to get her on some teams, and there were some coaches that would include her

but she just never felt right about it. hitting the ball and then making the other kids wait, just wasn't her idea of what baseball was. we thought she would just have to settle for being a fan; until rotary stepped in. and they built this special field. they took an idea of just letting the kids play baseball and made it fit these kids, rather than trying to make the kids fit the field. lauren forgets about what she can't do, because they've given her the opportunity to do something that we never thought possible. when these kids get to play ball, their heart is there they're so excited and they just get to feel like regular kids. on the phone i heard her telling her grandmother that she was the luckiest kid in the world. an soldiers hold in their hearts. it's home. chicago, illinois temple, texas georgetown, south carolina but when they're away from home,

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