In the last few months, Peyton has solved multiple cases for the FBI, while Marco has learned to navigate his role as police captain. Navigating their personal relationship has proven more challenging, however. Marco's jealousy over Peyton's newest friend, Mike, causes friction between them, but although he tries to curb it, he can't deny a growing feeling that something isn't right with this man. As Peyton struggles to understand his obsession, she's distracted by the cold case she's pursuing. Before she and Tank can gain any traction, however, Radar's wife provides the Ghost Squad with their latest mystery: vampires in Hollywood.