A Good Man Gone

It's summer in St. Louis and Mercy Watts is on vacation from her parents. The great detective and his nosy wife are on a cruise and Mercy thinks she's off the hook for doing any investigating for them. But when a family friend has a fatal heart attack, Dad has one of his famous feelings and orders Mercy to look into it. Mercy tries not to get sucked in. She really does, but she's her father's daughter. Soon Gavin's death leads to a more grisly one, the death of a bride on her wedding day. Can the two be connected? Was Gavin murdered? Now Mercy can't stop. You do for family. That's all there is to it.