Mordecai Tremaine is an elderly retired tobacconist, a fan of romantic fiction, and a wearer of pince-nez. Not a natural crime-fighting celebrity, you might think, but in ''In at the Death'' his burgeoning reputation as an amateur sleuth is both a blessing and something of a burden as he accompanies his good friend Inspector Boyce on the trail of a murderer in the city of Bridgton. The death of a local GP in an abandoned house looks like an unfortunate encounter with a tramp, but that doesn’t explain why the doctor had a gun in his bag. As the detectives get to work there are skeletons to be found lurking in a few closets.