They go to Prague to retrieve an incriminating diary. The target is preemptively killed and Will has to seduce his widow, who double-crosses him. Cornered after an hair-raising escape, she reveals the contents from her accurate memory.
Will and Frankie continue to clash, and their growing pains may jeopardize the team's next mission in Rome where they are sent to prevent a terrorist attack.
The team heads to Europe to transport a dangerous prisoner for interrogation, and the prisoner is Will's former boss; Jai helps organize a Secret Santa gift exchange for an off-season Spy Christmas.
Frankie is forced to prove herself when Will is captured during a mission to take down an organ harvesting operation; Will spends his time in captivity trying to bond with Jai; Standish seeks Frankie's help to improve his combat skills.
When an unexpected murder shocks everyone, Will goes to a dark place as he and the rest of the team are tasked to hunt down the culprit behind this unsetting attack.
Frankie's commitment to cold-hearted professionalism is tested when the team's new mission to take down the head of a massive drug operation reunites her with a former guardian, Kelly Ashland.
Ollerman attempts to force the team to commit a terrorist attack for The Trust using Ray's life as leverage; Jai helps Standish deal with a revelation about his girlfriend; Will and Frankie come to a realization about their relationship.
