'Murder, My Sweet' is based on Raymond Chandler's classic detective novel 'Farewell, My Lovely'. The book was later filmed in the 1970s under its original title starring Robert Mitchum. The Mitchum version is actually more faithful, but for some reason nowhere near as entertaining. 'Murder, My Sweet' tones down some of the racial and sexual aspects of the original story (which are included in the 1970s remake), and I'm might be mistaken (it's been a while since I read it), but the Anne Shirley character appears to have been created as a potential love interest for Dick Powell. She seems to have been inspired by a similar character in 'Double Indemnity' (written by James M. Cain and filmed the same year with the help of Chandler). Dick Powell was originally a crooner and casting him as Philip Marlowe was a very strange choice at the time, but it certainly works. Personally I would have preferred to see Robert Mitchum playing Marlowe in this version, but by the 1970s he was too old for the part, and comparing the two versions Powell definitely wins. Claire Trevor is also excellent as one of the definitive noir femme fatales, and her scenes with Powell are compelling. The drug sequence is also very memorable. 'Murder, My Sweet' is one of the most entertaining detective thrillers ever made, and along with 'Double Indemnity' and 'Out Of The Past' one of the very best crime movies of the 1940s.