Death of a Valentine by M.C. Beaton

Hamish Macbeth has had quite a year. He finds himself at the altar about to marry his constable, Josie McSween, although unhappily. Earlier, Josie had come to Lochdubh to assist Hamish on his beat. Soon after, they found themselves investigating the murder of local beauty Annie Fleming. Annie, it seems, had many enemies, so Hamish finds himself with loads of suspects. He also wishes he could work on the case by himself without Josie's assistance. She, however, persists with fantasies of a perfect life as his wife and figures working alongside him will help her achieve her goal. Will Hamish be able to solve the case even while more bodies pile up--and stay a bachelor?