After six weeks on the course, the recruits have learned to rely on each other and have come to appreciate the value of trust and collaboration. But this time they will have to embrace the darker side of spying: betrayal. Two recruits are the subjects of internal investigations and it is up to their fellow spies to set a trap and gather incriminating evidence. For some this will mean the end of the course. Spy school is closed and the recruits are about to graduate to their final mission, but first they must pass the ultimate test of loyalty. They find out what it's like when a spy thinks their organization has turned against them, and that they've been left out in the cold.