It Couldn't Matter Less

It Couldn't Matter Less
First edition
AuthorPeter Cheyney
LanguageEnglish
SeriesSlim Callaghan
GenreThriller
PublisherWilliam Collins, Sons
Publication date
1941
Publication placeUnited Kingdom
Media typePrint
Preceded byYou Can't Keep the Change 
Followed bySorry You've Been Troubled 

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.