Plot summary
Flashbacks reveal that Malcolm Black, believing David to be a terrorist, saved his life and recruited him. When David attempted to reach out to his daughter, Malcolm threatened to kill her unless David killed another man. When Louise's brother Lyman comes to town, Nolan arranges a dinner for him along with Louise and Emily. After looking into Louise's criminal record and seeing her become unbalanced at dinner, Emily investigates the prescription she is taking and discovers that Louise's family has been drugging her in order to control her inheritance. After Malcolm visits Jack at home to question him on Kate's whereabouts, Jack sends Carl away for protection and goes to David, who reveals he plans to meet and kill Malcolm.
He tells Jack about a flash drive that has evidence against Malcolm should he fail. Jack, in an attempt to save David's life, hands the evidence in to the police, only to discover (as forewarned by David) that it was found to be insufficient and Malcolm has been promptly released. Victoria is forced to tell Margaux the truth about Emily's identity and Ben overhears their conversation. Emily discovers that Victoria sent Kate after her the night Daniel died and confronts her, but Malcolm, having been released from the police, captures them both, now knowing who Emily really is.
Credits
Adapted from Wikipedia contributors, Revenge season 4. HTML formatting and reference markers removed.