The BAU team joins forces with the CIA to root out a mole working inside the latter organisation.When Gideon calls them in at 2am, the BAU team are confused and a little excited – they’re going to the CIA headquarters at Langley.They arrive to be told that Counter-Terrorism Unit (CTU) agent John Summers (Jack Conley, ‘Angel’), who has been protecting informant Aaliyah Nadir, has been found tortured and killed.Upon discovering Summers’s body, the CIA have ‘cleaned house’ by covering up the circumstances of his death and staging it to look like a suicide.The CIA believe that one of their number has been feeding information to Aaliyah’s husband, Saudi diplomat and terrorist-bankroller Hassan Nadir, which is how Hassan found out that his wife and children are in the US.He is now looking for them – and John Summers was the first to die in the process.The entire CTU has been locked down until the mole’s identity is revealed.Gideon, who has previously performed psychological evaluations on every agent in the CTU, points out that whoever it is will have an exit strategy in place – but that the BAU are blocking it.

After narrowing the list of suspects down to 16, the team are inspecting some security footage of Gideon meeting Summers for an evaluation.

When the CTU agent is heard telling Gideon that “only four people” could have ordered his evaluation, the team realise that he is talking about the four CTU agents who were involved in secret operations in Saudi Arabia – and that one of them must be the person who told Hassan his family were in the US.

The four agents in question are Gina Sanchez (Lisa Vidal, ‘ER’), Kruger Spence, Olivia Hopkins and Bruno Hawks.

As the team assess each of the four, evidence is turned up which could implicate any of them.

After Elle accuses Hopkins of being the mole, the CTU agent angrily storms off.

She is later found dead – who wanted to stop her talking?

When the other three are called in and told of Hopkins’ death, the BAU team watch them closely to see how they react.

“Someone is going to pay dearly for what they’ve done,” says Hawks.

Suddenly Garcia calls with some information: the virus that knocked out the CCTV cameras to obscure views of Hopkins’ murder started from Kruger Spence’s computer.

As well as this, crucial files have been erased from his hard drive.

Spence claims that he has been framed – but is he lying?

When it emerges that Summers ordered his own evaluation, the team realise that he did so because he knew that he would be videotaped; he wanted someone to witness his conversation with Gideon.

The team watch the footage again and realise that Summers knew that Hassan had been told the location of his family – he was using the tape to pass on coded messages about Aaliyah’s location.

The team decipher Summers’ message and work out that he hid the family in a shipping container at a nearby shipyard – but when it becomes apparent that someone has hacked into the feed and knows everything that they know, the team realise that they’re racing against time to find Aaliyah.

Gideon dispatches Morgan and Elle, telling them to take Gina Sanchez with them.

But will they find the shipping container and its precious cargo before Hassan does?