Mercy is a 2000 erotic thriller film directed by Damian Harris and starring Ellen Barkin.

Detective Cathy Palmer (Ellen Barkin) is on the trail of an elusive serial killer.

During her investigation she meets Vickie Kittrie (Peta Wilson), who belongs to an exclusive club of women who engage in secret sessions of bondage and S&M.

In order to catch the killer, Catherine must trust Vickie to guide her through the dangerous and illicit underground.

One of the strange things that happens in this movie is when Mary (Karen Young, from "Jaws the Revenge" and "The Sopranos") ties down her doctor (Julian Sands) after he dresses up like her mother.