Nightmare in Pink is the second novel in the Travis McGee

Travis McGee

Travis McGee is a fictional character, created by prolific American mystery writer John D. MacDonald. Unlike most detectives in crime fiction, McGee is neither a police officer nor a licensed private investigator; instead, he is a self-described "salvage consultant" who recovers others' property...

 series written by John D. McDonald. In it, McGee is asked by a friend from his military days to help his sister Nina in the investigation of her fiance's death and the large sum of money involved. The book's title is a reference to the inclusion of hallucinogenic drugs as a plot device in the climax.