The Final Case - Peter Sharp Legal Mystery #9
Peter attends a cocktail party at which, Suzi and the other guests are shocked by a loud noise coming from their host’s study. When they all go to investigate, they find their host dead of a gunshot wound to his head. The gun is in his hand, and several witnesses in the hallway state that no person entered or exited the room.
Suzi thinks it's murder - and wants to prove it. See if she succeeds.