It Couldn't Matter Less
It Couldn't Matter Less is a 1941 thriller novel by the British writer Peter Cheyney. It is the fourth in a series of novels featuring the London-based private detective Slim Callaghan who enjoyed a series of dangerous adventures similar in style to the hardboiled American detectives created by Raymond Chandler and Dashiell Hammett. It was published in the United States as Set-Up for Murder.