Two rock climbers in possession of a large stolen diamond are killed, and Don and the team hunt for the murderers; Charlie considers whether he should have his FBI clearance reinstated.

When eight people, including two police officers, are gunned down in a coffee shop, Don and his team uncover a trail of blackmail, corruption and romance; McGowan expands his investigation of Charlie and Don.

Don's team helps Agent Bloom, a veteran with the FBI, track down a con man who has eluded Bloom for years. Meanwhile, the final decision on Charlie's clearance is handed down, and it doesn't just affect Charlie. Don's job is on the line as well.

Don turns to his newly found religious beliefs when he is forced to deal with an escaped criminal who is bent on seeking revenge.

Feeling guilty over the stabbing, Charlie puts his attention on finding a serial killer using math theories to help the team solve the case before another life is taken.

Don and the team are sent to look into a series of bank robberies and soon name former FBI Agent Roger Bloom as their lead suspect.

When Amita is abducted, Don and the team’s frantic search for her leads them to the delusional head of a cult, but it is up to a distraught Charlie to discover what the suspect’s bizarre plans for her are.

When two FBI agents, part of a unit headed by Don's former mentor, are killed during a shootout with bank robbers, the team must investigate what exactly happened. Also, Charlie and Amita worry when Larry opts not to attend a conference in Geneva.

As Larry prepares to embark on his adventure, the team must investigate a string of murders. The case takes an interesting turn when it is discovered that the murders mimic scenes from a movie that hasn't even been released yet.