Excuse me, is this ticking time bomb part of the test?

Training for the FBI is all about survival of the fittest.

There are physical, mental, and emotional demands.

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Credit: Phillipe Bosse/ABC

NATs have to trust the person next to them.

They have to be willing to die for their fellow classmates.

And if youre able to differentiate between Nimah and Raina, you get bonus points in my opinion.

Simon certainly knows the difference.

And he plans on using this newfound knowledge to his advantage.

The twin bust certainly put a damper on his infatuation with Raina.

And hes not the only one taking cold showers.

Booth and Alex are on the outs, too.

But Caleb and Shelby are still going strong with role-playing trysts in the boiler room.

Especially when tests are involved.

Miranda gives them each a piece of paper and pencil, and leaves the room.

Everyone is surprised to discover that the papers are blank.

Alex figures that theyre evidence, so each one is collected, measured, weighed, and counted.

There are 60 pieces of paper, yet there are 61 NATs.

Wheres the missing piece?

Nimah suggests they watch the surveillance footage to see who isnt playing the game.

The footage plainly reveals that its Brandon.

I know what youre thinking.

Hes the cute guy fromGleewho is hooking up with Natalie.

He loses his cool and storms out of the classroom.

Thats when the air conditioning cuts off and all of the doors lock the NATs inside.

Is this part of the test?

Or do we have another Elder Eric situation on our hands?

Unfortunately, the wires have been cut, and theres no way out of the room.

Alex begins interrogating Natalie.

She admits that Brandon hasnt been himself for days.

Simon backs up the surveillance tape to earlier in the day.

Sure enough, Brandon walks in and places something in the podium.

Simon and Alex bring up the door and find a bomb.

And I thought taking the SAT was stressful.

MacGyver to the rescue again!

Of course Simon knows how to disarm a bomb.

On his first attempt, he successfully unlocks the doors but doesnt stop the bomb timer from counting down.

Most of the class, including Elias, run for the hills.

Their efforts only make the timer move faster.

Brandon was in on the game the entire time.

And because Elias left during the bomb scare, he has been kicked out of the program.

But not before he gives Simon a passionate good-bye kiss.

The fake near-death experience also causes Booth to open up to Alex.

He finally tells her what went down in Chicago.

It was a blown sting operation.

Booths superior screwed up, but Booth took the blame.

That superior was Liam.

Alex now understands that Liam has power over Booth.

She demands that he give Booth back his Special Agent status.

Then Booth drives away from the Academy in civilian clothes with Alex watching.

Booth isnt the only one leaving.

Caleb has also left the building without saying good-bye to Shelby.

Clayton tells Shelby that Caleb doesnt belong in the FBI, noting that hes a greater danger to himself.

Shelby stands up for Caleb and then finds him outside sporting a NAT blue Henley.

Caleb is now training to be an agent again.

She pleads with Simon to help her find them.

(Alex is lucky to have this dude on her side.)

Alex wants to know why Raina was at Grand Central Station?

And Raina sighs with relief this news means Nimah is alive.

Raina explains that Nimah infiltrated a terrorist cell holed up across the street.

This group was known to be targeting landmarks.

The twins knew there would be a bomb, but they didnt know where.

Raina hasnt seen her sister in five days.

No one has been in or out of the house.

She has no way of knowing if Nimah is okay.

Alex wonders if Nimah was in on the bombing?

Raina swears she wasnt.

Simon pulls out a pair of thermal goggles.

Just call him 007.

He can tell that there are five figures in the house.

One is a woman.

NEXT: Hit me with your best shot

Across town, Shelby walks up to Calebs work station.

Hes combing through footage and has noticed the twin.

Caleb admits that the only reason he is keeping his mouth shut is for his mothers political reputation.

Shelby wishes him luck finding Nimah and turns to leave.

Caleb makes a face.

Who said anything about Nimah?

Shelby rushes over to Booth so they can get out of the building.

Natalie catches up with them, begging Booth not to run off to help the woman who shot him.

Booth explains that he was covering for Alex.

Shelby agrees that Alex is innocent.

Natalie lets them go, but she puts a tracker on Booth.

And thanks to a burner phone number he got from Miranda, Booth heads straight for the twins.

Meanwhile, Alex tells Raina that Nimah has to know something about the bomb.

Raina saunters into the house with a bag of groceries.

One of the terrorists thinks this is odd.

The others clean their guns while watching cartoons.

I found that odd.

Raina heads to the bathroom, intercepts Nimah, and shoves her out the window where Simon is waiting.

Nimah is furious that Alex and Simon have put Rainas life in danger.

She knows that the terrorists are planning an attack.

The leader left two days before the bombing.

She isthisclose to getting him to trust her.

She doesnt want Raina to be with him because he has arranged for them to leave the country together.

Suddenly, Shelby and Booth show up to the apartment.

They let everyone know that the FBI is on the way.

Its time to get Raina out of the terrorist house.

Unfortunately, the bad guy leader is back and hes making out with Raina.

Nimah runs ahead to get her sister while Booth and Alex watch from the back room.

Natalie rushes in with an entourage of agents, grabbing Shelby and Simon.

The sirens and shouting startle the terrorists.

They come out with guns blazing, and one of the bullets hits Booth in the gut.

This guy has the worst luck, as well as nine lives.

Alex picks him up and limps along in the alley.

They run straight into Natalie.

Alex gives herself up to save Booth.

Natalie thinks for a few seconds before shouting for the two of them to GO!

You just secured a not guilty verdict on my list.

Suspects

Alex: Not Guilty.

Liam OConnor: Not Guiltythis week.

He still appears clueless.

Miranda Shaw: Not Guilty.Handing over the twins phone number was a good move.

Ryan Booth: Not Guilty.

Nimah: Guilty.I think its suspicious that she was so eager to get back in the terrorist house.

Shelby Wyatt: Not Guilty.

Simon Asher: Not Guilty.But definitely needs a license to kill if he doesnt have one already.

Caleb Haas: Not Guilty.He is too close to Liam and Natalie.

Natalie Vasquez: Not Guilty.Especially when she let her bleeding boyfriend leave with a suspected terrorist.

Elias Harper: Not Guiltyof attack, but Guilty of being a coward.

Executive Assistant Director Clayton Haas: Guilty.Hes definitely up to no good.

Brandon Fletcher: Not Guilty.