"Excellent Intentions" by
Richard Hull has an interesting twist on the interwar crime novel. The trial of the person accused of murder takes place throughout the book with flashbacks to the discovery of the murdered man and the police investigation. The twist however is that the identity of the accused in the dock is not revealed until the end of the story.
This means that throughout the investigation and the interaction between the detective and the possible suspects (of which naturally there are a lot as the victim was rather unpopular - not an uncommon Golden Age theme) you don't know which piece of evidence is relevant to the trial.
An interesting and enjoyable variation on the Golden Age murder mystery.
