Annalise learns unexpected and shocking details about Sam's past. Meanwhile, Connor and Michaela feel the pressure when the FBI learns there is new evidence in the case; and Frank and Bonnie's history is explored, revealing what originally fractured their relationship.

Annalise discovers there's a surprise witness who threatens her case; Connor tries to persuade the K3 to go along with a new plan; a lie between Frank and Bonnie threatens their relationship as the killer is finally revealed.