Death of a Valentine (Hamish Macbeth #26)
M.C. Beaton

While locals think Josie is quite a catch, Hamish has a case of prenuptial jitters. After all, if it weren't for the recent murder of a beautiful woman in a neighbouring village, there wouldn't be a wedding at all. For it was a mysterious Valentine's Day package--delivered to the victim before her death--that initially drew Hamish and Josie together on the investigation. As they work side by side, Hamish and Josie soon discover that the woman's list of admirers was endless, confirming Hamish's suspicion that love can be blind, deaf . . . and deadly.