While Dexter uses lessons he learned from Brother Sam to follow up on some new leads in the Doomsday investigation, Debra butts heads with Captain LaGuerta over the case of a dead call girl.

Patrick Jane and the team investigate the murder of a mayor's aide, and Rigsby and Van Pelt make a big announcement.

A Hollywood hairstylist is murdered. Brenda's folks show up.

A double-homicide in Tijuana points to police corruption.

The squad tries to stop an explosive massacre.

A horrific car accident puts a family's fate in the hands of the Gaffney staff. Ripley questions Lenox and her increasingly reckless behavior.

A Hollywood hairstylist is murdered. Brenda's folks show up.

A double-homicide in Tijuana points to police corruption.

The squad tries to stop an explosive massacre.

A horrific car accident puts a family's fate in the hands of the Gaffney staff. Ripley questions Lenox and her increasingly reckless behavior.

When a girl with a tattoo connection falls into Borden's care, he brings her case to the FBI team - but her ties to a terrorist organisation prove dangerous for all. Meanwhile, a conflicted Jane grows closer to Weller, and friendship blooms between Borden and Patterson.

Patrick Jane and the team investigate the murder of a mayor's aide, and Rigsby and Van Pelt make a big announcement.

A Hollywood hairstylist is murdered. Brenda's folks show up.

A double-homicide in Tijuana points to police corruption.

The squad tries to stop an explosive massacre.

A horrific car accident puts a family's fate in the hands of the Gaffney staff. Ripley questions Lenox and her increasingly reckless behavior.

The FBI is locked down when criminal hackers infiltrate the building, trapping the team inside SIOC. As they fight their way out, the close quarters force Mayfair, Zapata, Reade, and Sarah to confront personal conflicts.

Patrick Jane and the team investigate the murder of a mayor's aide, and Rigsby and Van Pelt make a big announcement.

Brenda brings her parents along on a murder investigation.

A decomposed overweight body turns up in the trunk of a car.

Riley and Walker investigate the murder of a beloved museum security guard and the theft of a priceless artifact. Baxter and Price must balance their pursuit of justice with public pressure to return the artifact.

A talented local news reporter is brutally murdered. Maroun's mentor takes the case for the defense, pitting Maroun against the woman who shaped her career.

While Dexter receives help from an unexpected source in hunting the Doomsday Killers and staying one step ahead of Homicide, Debra discovers something new about herself in therapy.

Dexter tries to figure out the Doomsday Killers' next victim before it's too late. Elsewhere, Debra has a strong reaction to a crime scene, which leads her to the realisation that she leans too heavily on her brother.