Castle is hired to uncover if a client’s husband is having an affair, but the case takes a shocking turn when Castle witnesses the client’s murder – by her husband. But with no proof that the killing took place, Castle and Beckett must investigate to expose the truth.
When a young Latin telenovela actress is murdered, Beckett and the team delve into a case that is as flamboyant and full of intrigue as any telenovela.
After being forbidden to work with Kate Beckett or the 12th Precinct, Castle obtains a P.I. license and shows up unannounced at Beckett’s crime scene, hoping to investigate alongside her as a private eye. But things don’t go as Castle had planned.
When an ER physician is gunned down in the street, Castle and Beckett soon discover that the victim was a mob doctor to a Mafia family run by an old friend of Castle's. Also, against this backdrop of Christmas, Esposito and Lanie reach a defining moment in their relationship.
When the star of Castle’s favorite ‘80’s action movie is mysteriously murdered, Castle and Beckett delve into the victim’s secret past and pursue his killer with help from a team of aging action heroes. Krista Allen and Ted McGinley guest star.
When subway passengers, including Detective Esposito, are taken hostage by a mysterious gunman, Castle, Beckett and the team must uncover the gunman's agenda before it's too late.
When Castle and Beckett learn that a murder victim may have been poisoned at an Old West-style resort; they visit the resort—posing as newlyweds—to uncover the truth.
A murder investigation launches Castle into what seems to be an alternate universe where he's never met Kate Beckett. Castle has to convince Beckett, Esposito and Ryan—now complete strangers—to let him participate in their investigation so he can find his way back to his own world. This inspires Castle & Beckett to finally take a trip to the altar.
When a web celebrity is murdered, Castle and Beckett explore the flashy world of internet fame. But when the killer posts pictures from the crime scene on a photo-sharing site, they realize they are up against a social media sociopath who may strike again.
This is the fourth episode of Castle season seven. It is written by veteran series writer, Rob Hanning.