Nightshade by Susan Wittig Albert

3rd in the family trilogy but 16th book featuring China Bayles

China had an uneasy relationship with her dead father, which was not helped by the fact that he had a mistress who bore him a son. When her half-brother Miles asks for her help in proving that their father's deadly "accident" years ago was instead murder, China balks. Her husband McQuaid, a PI, happily takes on the challenge of unraveling the mystery behind China's father's death. Each chapter goes from China's to McQuaid's point of view giving us some insight on each of them.

While there is a murder in this mystery it is more China's journey to finding herself and somekind of connection with her dead father. Plus we find out a lot about Nightshade. fun as always.