As Alex O'Connor, a CIA analyst, receives his first assignment, his parents - secretly members of the dormant Russian sleeper cell he is investigating - receive an unwelcome visitor and an assignment of their own.

Katya is forced to tell a lie that ends up causing a rift between Alex and Mark, while Alex starts working on a CIA-FBI task force.

Alex must talk the FBI into risking a dangerous covert operation to locate Mikhail's hidden cache, while Katya discovers a secret.

Sam encourages Alex to continue looking for clues, the Rezident doubts Mark and Katya's commitment to the cause, and Natalie learns how lethal Black Dagger can be.

When the FBI suspects a mole in the organisation and brings in an investigator, Alex must confront his morals. Also, Victor finds a new way to watch the O'Connors.

Natalie must rely on an outsider to help find important information on Black Dagger, Alex and Sam plan a risky sting operation, and Katya wants Alex to throw the task force off track.