Premise: Double Whammy is a 1987 novel by Carl Hiaasen. The protagonist, a private investigator, is hired to expose a celebrity bass fisherman as a cheat and is drawn into a frame-up for murder. The book introduced the character of "Skink" (Clinton Tyree), who becomes a recurring character in Hiaasen's subsequent novels.
Hypothesis: Double Whammy was later made into a movie.