A seemingly random murder of a mother on a busy playground rattles an English town. Cop Bobby Day starts receiving anonymous packages with clues.
Alec invites Nina to his mother's party. A DVD sent by the ghost detective leads Bobby and Alec to investigate in secret -- with grave consequences.
The ghost detective visits Alec in the hospital. Sheri recalls a detail from her last night with Ruben. A post office clerk provides a crucial lead.
Dr. Crowley tries to blackmail Lucy. Nina discovers the ghost detective's lair. In Düsseldorf, a shady associate reveals a motive for Ruben's murder.
The ghost detective offers the police a deal. Nina drops a bombshell. The man in the hoodie is captured. Bobby spots Marquita in a surprising place.
A code name found in Angela's typed document leads the police to discover what Ruben was involved in. Photos of Lucy's past push Bobby over the edge.
Bobby returns from Düsseldorf and seeks out Lucy. Dr. Crowley is seen hiding a phone. A nurse from the drug trial tells Nina a chilling story.
Linda reviews the bus crash case for an overlooked link to Mainline. While Henry tries to force a confession from Dr. Crowley, an assassin lurks.