Each of the kids has a secret
If you liked Succession, you will love Not a Happy Family by Shari Lapena. An overbearing, gaslighting and wildly successful father, a weak mother and three grown children with lots and lots of issues. But on Easter Sunday after a contentious family dinner that included the housekeeper/former nanny as a guest, Mom and Dad are murdered. Brutally. Each of the kids has a secret, each stands to inherit a fortune, and each is lying.
At least three times during this book, I thought I knew who the killer was. I was wrong every time. I don’t know how Ms. Lapena does it, but she is the gold standard in domestic noire.