In "The Way of the Ninja," Castle and Beckett investigate the mysterious murder of a Japanese ballet dancer, they end up being targeted by a ninja assassin.
When Castle and Beckett wake up in bed, handcuffed together, in a locked room with no memory of how they got there, they must piece together the mystery of where they are and why, all while trying to escape. But as the two of them adjust to being shackled together, what's the biggest threat they face... the people who abducted them or each other? Meanwhile, Ryan, Esposito and Gates are left to investigate their disappearance in a case where all is not what it seems.
A frozen woman found tangled in steel bars at a construction site leads Castle and Beckett to a years-old mystery and a long abandoned case. As the two uncover startling revelations about the victim’s past, the investigation forces Beckett to face some difficult memories of her own, which provides Castle insight into his muse and additional material for his novel.
Mysteries abound when pallbearers at a funeral lose control of a surprisingly heavy casket only to have a second unknown woman tumble out along with the original deceased. When Castle and Beckett learn that the victim was a doctor at County Hospital, their investigation takes them into the world of amorous, bed-hopping physicians. Did jealousy turn to murder, or did the doctor's mysterious work outside the hospital lead to her demise? Meanwhile, Castle's relationship with Gina is challenged when she tries to bond with Alexis.
When an up-and-coming professional skateboarder is gunned down by a mysterious motorcyclist, Castle and Beckett are thrust into the world of extreme sports, where the death defying stunts aren’t the only thing that’s dangerous.
Castle's novel "Heat Wave" is being turned into a movie, and the Hollywood hottie cast as the movie's lead shows up at Beckett's invitation to better understand the character she's going to play. Laura Prepon ("October Road," "That '70s Show") guest stars as actress Natalie Rhodes. As our threesome investigates the murder of a high-class matchmaker, Natalie goes to extremes in the name of "character research," transforming herself into the spitting image of Beckett -- much to Castle's delight and Beckett's dismay.
Detective Kevin Ryan is on the security detail of a charismatic congressman attending a charity event when shots suddenly ring out. Driven to apprehend the killer, Ryan must revisit the events that led up to the shooting, with the help of Castle and Beckett.
This is the fourth episode of Castle season seven. It is written by veteran series writer, Rob Hanning.
"The Greater God" — The death of a Wall Street puts the team on a collision course with Gates' sister.
With tensions rising between Castle and Beckett, Castle finds himself a new partner -- Detective Ethan Slaughter (guest star Adam Baldwin, "Firefly"), a tough and colorful cop from the city's gang unit. But Castle gets more than he bargained for when Slaughter shows him a grittier side of police work that puts Castle in the line of fire like never before.