Peter Cheyney 
The Urgent Hangman [EPUB ebook] 

Slim Callaghan had been hired by beautiful Cynthis Meraulton to stop her cousins getting her step-father’s money. But when the old man is murdered, the only suspect with no alibi and a giant motive is Cynthis. Slim always played his cases the way they came, but it turned out the Meraulton job had more twists than a hangman’s rope. ‘Slim Callaghan’s quick wit and knowledge of rough and tumble place him in the top ranks of private eyes. What a man!’ New York Times Book Review