Dexter has always managed to get himself out of tough situations. But he suddenly finds himself in unfamiliar territory - life in suburbia. Now a husband and father of three, Dexter struggles to balance his family's needs with his ongoing duties as a blood spatter analyst for Miami Metro Homicide. The exhaustion is taking its toll, and as sleepless nights start to threaten his job performance, Dexter wonders if maybe he's taken on more than he can handle. And he'll need to stay sharp - the department is busier than ever, with two new murders on their hands. The detectives, Debra included, are surprised when Special Agent Frank Lundy returns to share his theories on the case. Lundy believes they're dealing with a serial killer he's been chasing for years, whom he's dubbed "the Trinity Killer". Meanwhile, Dexter's Dark Passenger drives him to seek out a fresh victim. But with so much already on his plate, is Dexter up to the task?