Frank Deal

Elizabeth and Philip come together to deal with a mission gone wrong, but struggle to reconcile their ideologies; Stan welcomes a Soviet defector to America; Nina acclimates to her new living arrangements.

Danger mounts for Elizabeth and Philip as they get closer to the inner circle of the CIA Afghan Group; Stan monitors Zinaida; Agent Aderholt challenges Agent Gaad on a crucial operation; Arkady tasks Oleg and Tatiana with gathering intel.

When the situation with Tuan takes an unforeseen turn, Philip and Elizabeth are thrown off track; Henry makes a surprising proposition; Stan encounters Frank Gaad's widow.

As Sherlock is shocked by the reappearance of his former lover, Irene Adler, a series of flashbacks reveal the tumultuous events that led to his downfall into addiction.

Danny promises a child that he'll open a cold case, the death of his firefighter father. Meanwhile, Jamie saves a baby from a burning building but worries that his new-found fame as a hero in the press jeopardises his job.

The investigation into a girl's disappearance leads to a high-tech kidnapper who uses the internet to cover his tracks; Rollins reconnects with her sister.