S1, E21: Henry tackles the most important case of his career: the disappearance of the love of his life, Abigail (recurring guest star MacKenzie Mauzy), after she left him. Desperate to find out where she might have gone, Abe, unbeknownst to Henry, secretly contacts Lucas to help find clues to her whereabouts. Already involved in a murder investigation with Jo, Henry involves Lucas and the team of detectives under the guise of searching for "Abe's mother" — never letting on his own relationship with Abigail. Henry and Abe's anxiety increases as one terrifying domino falls after another, until Henry uncovers the horrifying details of Abigail's last secret. Guest stars include Burn Gorman as Adam, Boris McGiver (Person of Interest, Boardwalk Empire) as Vance and Tim Guinee (The Good Wife, Revolution) as Teddy Graves.