Mrs. Mallory and a Death In the Family — Hazel Holt

Sheila Malory is less than thrilled when her loathsome cousin Bernard comes to Taviscombe looking for information to complete his family tree. After all, she's got better things to do than listen to Bernard's pompous genealogical lectures and watch him berate his mousy wife. But when Bernard dies suddenly in his rented cottage, it's more than family obligation that keeps Mrs. Malory on the case. Someone wanted Bernard out of the way, and with all the dirt he was digging up on the family, the killer could be more than kin...and less than kind.