While her mother is away on business, a young girl home alone with her older brother witnesses her neighbor's kidnapping. But no one believes her--not her brother, not the cops. So she takes matters into her own hands putting her life at risk to save her neighbor.

A plague of vampirism is sweeping New York. Susan has recently been turned now she needs to find her first victim. She seduces, then infects her boyfriend Burt. He infects Jasmine, who then ravishes Kate and so it goes on.

Olivia (Isabel Sandoval), an undocumented Filipino transwoman, works as a caregiver to Olga (Lynn Cohen), an elderly Russian woman, in Brighton Beach, Brooklyn. When Olivia runs out of options to attain legal status in the US, she becomes romantically involved with Alex (Eamon Farren), Olga's adult grandson, in the pursuit of a marriage-based green card.

The stakes have never been higher for Philip and Elizabeth as personal and professional dangers continue to challenge the Jennings' mission.

In season three, Philip and Elizabeth find themselves at odds over their daughter’s future now that the KGB is determined to recruit her and FBI Agent Stan Beeman has rededicated himself to uncovering the identities of the Russian spies.