where's the closest emergency room? where? st. barclay's. st. barclay's. and where is it? it's 4 blocks uptown, one block east. where's the emergency entrance? under the hospital. just follow the signs to the e.r. ok. hey, look who's back. hello. is she awake? is that aaron? are you aaron? yeah. kate, we made it. thank you. don't thank me. thank your partner. he did it all. [siren] hotch: what's this? secret service. we're directing all emergencies over to lenox hill. i'm ssa hotchner. i have ssa joyner on board. she was injured in the bomb blast at federal plaza. credentials.

i appreciate that, agent, but this hospital is on a strict bypass. what is--what's that? it means the hospital is closed. we're redirecting all emergencies to lenox hill. she's not gonna make it to lenox hill. i'm losing her! she's crashing! she's crashing! i'm losing her. please. open it up. his is delta 2. i need immediate e.r. attendance. what do you got? bp 50 over 30, she's bradycardic with severe spinal iury. get her in the bag. get in the crash cart. [voices overlapping and distorting] [crash ok, can i get some help in here?

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garcia's running them through vicap. these are smart, well-educated kids, hand-picked and trained to be martyrs. they're not gonna be in any government file and they won't have rap sheets. hotch and kate are at st. barclay's hospital. how are they? well, hotch is in the e.r., kate's in surgery. morgan's on his way down there now. the media's reporting this as a failed attack on 26 federal plaza. well, it's not. they're not the only ones. homeland security feels the same way. they're wrong. they found nothing at any of the sites that you told them that these guys were targeting. maybe this thing is over. or maybe that's exactly what they want us to think. as soon as the bomb techs identify the device, i want to know about it. of course. can you get in tighter on the bomber? here, in his hand. he's using his cell phone. joyner and hotch approach the van. why not wait until they both get in? gus he figured he was close enough. wouldn't you wait until they were in it? so far these guys have accomplished nothing. nothing? my partner was shot--cooper? 8 innocent people were killed. 2 agents blown up. not to mention emily's suicide by cop. is that not enough?

this isn't. doc. fbi. how's aaron hotchner? he's got acute acoustic trauma in his right ear, and i pulled shrapnel from his leg. just lay down. sir! agent hotchner, lie down. doctor, i'm all right. hotch, stop it. just calm down. doc, i got it, ok? morgan, where's kate? she's in surgery. where are my clothes, please? hotch, your go bag is on its way. has anything happened since the first blast? nothing. sam? he's dead. morgan, the profile's wrong. everything--everything they've done so far has appeared to be sothing it's not. i don't follow. the seemingly random acts of murder, the attempt to hack into our security surveillance systems. the suicide by cop to make us all believe that it was over. don't forget the death card telling us they know we're watching. all diversions. to ensure our attention and analysis of any given situation would than incorrectly inform our profile. so the first responders were not the real target? hotch and kate were a diversion, too?

morgan. hotch wants you guys over there now. what do we tell homeland security? tell them if they love this city as much as you do to keep it locked down. it's about to get hit. are you ok? yeah. i just want to understand why i'm still alive. i think the idea was to maim, not to kill. did you identify sam, the bomber? garcia put sam and the other dead unsub into every know database. nothing. we know how terror cells evolve. they learn from one caaign to the next. how to stay off radar like the london bombers. yeah, but they, uh, they hit at 8:50 in the morning with a series of coordinated blasts aimed london's transportation system, and this cell targeted a lone suv where the only people on the street are 2 federal agents. it's not multiple targets, it's one target. one target, one bomb. garcia said the device was placed under kate's suv. it was likely made using oxydizing agents, including chromates, peroxides, perchlorates, chlorates, and red mercury,

imagine what a bomthe size of an oil drum could do. yeah, but to make something that big, you'd need a chemical engineer. like the recently deceased dr. azahari husin, asia's most-wanted bomb-maker? authorities dubbed him the, uh, demolition man. rossi: he treated each bomb like a work of art. one wronmove... he becomes a victim of his own creation. he'll be more revered than all of the people who died as a result of his devices. stop the bomber, stop the bomb. to do that, we need to know how they would deploy something that big. hotch. did you ever find sam's cell phone? did he call 911? yes. no. he dialed one number 6 times every few minutes. it was a disposable cell. garcia tracked the number, but it went dead minutes after sam died. whoever had it destroyed it.

there's only one reason that he stayed with us. to make sure the ambulance got to you. and in a city on lockdown, an ambulance with its siren blaring and lights on, it's gonna make it through every roadblock virtually uncontested. this hospital is on a strict bypass. what is--what's that? it means the hospital is closed. and straight into a hospital with a bypass order on it. what? secret service has a bypass on this hospital. secret service? who are they protecting? that's who sam was calling, the paramedic on the ambulance. the ambulance which i drove in here. this hospital is their target.

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hey. who you got in here? why is that information important to you? the ambulance i drove in here-- where it now? there's a bomb in it. in the basement. why? it's rigged. what? it's rigged to assassinate whoever it is you're protecting. you need to get them and everyone else out of here right now. we can't do that. he's undergoing surgery as we speak. the paramedic i came in with-- do you have eyes on him? that a cell in his hands? garcia, can you remote access the cell phone grid i'm in and jam all the frequencies? yeah, i can, but only for a short period of time. there's a bomb in the basement of this building. i'm on it. ok, we need to access and pinpoint the 3 closest cell towers to the location and then disrupt the satellite feeds to them and we need to do it fast. here we go. prentiss: look, he's coming back. he's gonna detonate the bomb manual if he has to. he went to find the ambulance. where did morgan go? let's head down. alone? call air charlie one. move echo one tohe roof as soon as he's out of surgery. air-vac him out of here.

morgan? yeah, baby. you sound stressed. do i? where are you? not where i want to be right now. [shouting] [bodies fall] [fires] garcia, take this down f me. fdny 108. that's an ambulance. are you ok? yeah, i'm fine. just track it for me. he's going to the basement.

oh, my god. [beeping] garcia, how long can you keep jammg the cell phone lines? uh, a few minutes, max. why? 'cause i'm gonna have to get this ambulance out of here. or you could just evacuate the building like everybody else. no. as soon as theirways a clear, this thing's going up. going up? oh, my god, that's like 3 minutes, 'cae that's when the satellite moves position. come on. garcia, listen to me. i need you to find area of town i can drive this thing, and you tell everybody, you hear me, everybody that i'm coming. come on, babe. do it! go! [engine starts] all right, talk to me, garcia. ok. head north... and floor it. i'll tell you where to turn.

what was that? it was nothing. just talk to me! no! no! nooo! aah! noooo! prentiss.

how am i doing, garcia? how's he doing? one minute, 50 seconds. why does it always have to be you? why do you always have to do this? come on. come on! derek, you don't have much time. please be smart about this. signal's coming back online 30 seconds to full coverage. derek, drive to the opening and then get the hell out. there'something i really want you to know, garcia. 20 seconds. save it. just get out. no, no, no, i'm noquite there yet. 10... morgan... 9...8... just listen to me.

morgan! we just lost tracking. [siren] derek? fbi.

garcia... [breathing hard] ll tell you what you are to me. you're my god-given solace. woman, you promise me one thing... whatever happens... don't you ever stop talking to me. i can't right now 'cause i'm mad at you.

what's happening? where's the surgeon? we did all that we could.

m telling yo 're gonna get caught. come o kid, we're cops. smoking in a hospital is a federal offse. you're on your own, kid. i see the wife and kids came for a visit. mm-hmm.

gi me a break. i just got shot. now i'm standing in front of a beautiful woman hiriculo garb th...i. and a catheter coected to my...skididdibup. could've told me you were coming. yeah, i wasn't going to and i... i thought i'd drop in... oh. i'm on my way to the airport n. yeah. um... sorry to hear about agent joyner. and hotchner-- is he ok? uhhe cant flyfor a little bit. his ea are... but he's gonna be fine. um, so--ok, i brght this for you. for you and your family. i'm told they are great seats. you didn't have to. i know. i wanted to. cod just as easi

goa plane toatch. ke care, cooper. oh, whoa. whoa. mets tickets? most people assume i'm a yankees fa i'm not most people. [chuckles] nope. no, that girl is not. thanks. hey. uh, uh, uh, uh. got it. i'm your ride. i thought agent davis was driving me. she was. i had her reassigned. n'yove sometng better to do? than to annoy you fo3 hours? hl, no. give mthe keys not a chancehotc let's go. so did we ever find out who the secret service had in the hospital? does it matter?

quantico has requested you transfer to run the new york office. hotch; they haven't even buried her yet. we are at war, things change. don't i need yourrecommendation? you didn't give it, did you? your actions... as incredibly brave as they were, were still the actions of an agent who doesn't truly trust anyone. hotch; i did it for this team. my opinion doesn't matter. the job is yours if you want it. hotch, your opinion matters to me. my life matters to me and i have and always will entrust you with it.

still want to drive? previously, on "criminal minds"...

[car alarm blaring] [muffled] hey, are you ok? cooper: hotchner, is he ok? he can't fly for a little bit. his ears are-- but he's gonna be fine. captioning made possible by touchstone television and cbs, inc. [distant clattering]