When Castle and Beckett discover that the victim of a building fire was actually shot to death, they get on the trail of a serial arsonist turned murderer.

The BAU investigates a workplace shooting committed by a state-of-the-art drone in Silicon Valley.

As Buck’s life hangs in the balance, he dreams of a world where he never became a firefighter, for better and worse.

Without telling Emily or her parents anything, Bill decides with Zoe to test on Emily the biological weapon he hopes to be able to use against the aliens. Catherine, for her part, has had difficulty managing her grief since Mokrani's death. She now has only one thing on her mind: to find out who Bill Ward is and find him. Sophia is ready to help him, but Nathan hesitates.

A dry thunderstorm rolls over LA, bringing in a series of lightning strike emergencies for the 118 and leaves a first responder’s life hanging in the balance. Athena and May go undercover at the rehab facility to help Bobby with his investigation into his sponsor’s mysterious death. Maddie dreads her parents visit to her and Chimney’s new and unfinished house, while Chimney get a surprise of his own from a visiting Albert.

The BAU investigates three similar crimes in which victims' remains are discovered in old suitcases.

A body disguised as a scarecrow is found with a bullet wound in a remote cornfield, and the team is forced to work against the clock to avoid a storm and potential complications that would affect the evidence.

Castle and Beckett help Alexis with an Innocence Review case. With only 72 hours until his execution, their goal is to prove that the death row inmate was wrongly convicted. But, some of what they uncover may only strengthen the case against him.

Castle and Beckett arrive at a crime scene to discover that the female victim bears a shocking resemblance to Medical Examiner Lanie Parish.

Castle and Beckett work the murder case of a famed relationship therapist. At first it appears that client secrets may have been the motivating factor, but then a rare valuable object is discovered in the victim's possession.

Agent Matt Simmons joins the BAU team in a race to take down Mr. Scratch and save one of their own in the process.

The BAU investigates three similar crimes in which victims' remains are discovered in old suitcases.

After two men die in a duel, Harrow uncovers a web of Machiavellian intrigue within a suburban historical society. Meanwhile, the return of Tanya forces Harrow to reassess the last twenty years of his life.

Castle and Beckett arrive at a crime scene to discover that the female victim bears a shocking resemblance to Medical Examiner Lanie Parish.

As Buck’s life hangs in the balance, he dreams of a world where he never became a firefighter, for better and worse.

Castle and Beckett arrive at a crime scene to discover that the female victim bears a shocking resemblance to Medical Examiner Lanie Parish.

A BMX rider's remains are discovered on the roof of a warehouse after a failed bike stunt. Sweets turns to Booth for advice about his relationship with Daisy and Booth makes a decision about his relationship with Hannah.

When Castle and Beckett discover that the victim of a building fire was actually shot to death, they get on the trail of a serial arsonist turned murderer.

When successful businessmen in Detroit are targeted by an anger-driven power-assertive Unsub, the BAU is called in to investigate.

The BAU investigates a workplace shooting committed by a state-of-the-art drone in Silicon Valley.

While Harrow investigates a baffling crime involving siblings, James brings danger closer to his half-sister Fern than ever before - and pays a high price.

When the mummified remains of numerous victims are found in the walls of an elderly couple's remote South Carolina home, Rossi, JJ, and Simmons are dispatched to track down a trail of clues that date back over 20 years. The hunt becomes urgent after BAU learns the killer has a specific ritual of when to strike, and like clockwork another person goes missing. Also, Rossi reconnects with his ex-wife, Krystall.

When Colter finds a lost dog at a gas station in Denver and the dog is subsequently stolen from his truck, Colter makes it his mission to track him down and reunite him with his family.

Castle and Beckett arrive at a crime scene to discover that the female victim bears a shocking resemblance to Medical Examiner Lanie Parish.

While Harrow investigates a baffling crime involving siblings, James brings danger closer to his half-sister Fern than ever before - and pays a high price.

The liquefied remains of a wedding planner are found in her home tanning bed on Valentine's Day, and Cam pressures her team to solve the case in time so she can celebrate the holiday with her boyfriend.

When Garcia experiences anxiety over a case that's personal to her from her past, Morgan visits to lend emotional support.

Ryan Murphy, Brad Falchuk and Tim Minear reimagine the procedural drama with "9-1-1." The series explores the high-pressure experiences of first responders -- including police officers, firefighters and dispatchers -- who are thrust into the most frightening, shocking and heart-stopping situations. These emergency responders must try to balance saving those who are at their most vulnerable with solving the problems in their own lives. The show draws from real-life, high-pressure experiences of first responders who regularly face heart-stopping situations that are often unpredictable, intense and uplifting at the same time.