When a half-naked woman is found covered in caramel sauce and hanging by bondage cuffs in a public park, Castle and Beckett’s investigation takes them into New York’s underground world…

Liv’s newest corpse is a sociopathic hitman, and she’s apathetically shocked to discover that she no longer feels emotions. Meanwhile, Marcy turns up as a full zombie and Ravi hopes…

Don attempts to track down a friend, Joan tries to solve a problem with an account and an unlikely person sets up Peggy.