Goodnight, My Love (1972)

"The time: 1946. The men: Hogan and Doyle, private eyes. Their client: A luscious blonde with a figure that would knock you out and some friends who would knock you dead."

Gruff gumshoe Francis Hogan is hired by a mysterious woman to find her boyfriend who has gone missing. With his perpetually hungry partner in tow, Hogan must untangle a web of intrigue involving the criminal underworld and a dead courier. One double-cross follows another as Hogan investigates the whole sordid affair.