A gunned down ER physician turns out to be a mob doctor.
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.
A famous action star from the 80's is found murdered.
When the star of Castle's favorite '80s 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.
A routine investigation turns deadly when a gunman takes hostages.
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.
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