Used to Kill — Lillian O'Donnell

Emma Trent's husbands have a habit of dying. But New York City P.I. Gwenn Ramadge refuses to believe her lovely client killed her latest spouse--and sets out to prove it despite mounting evidence to the contrary. There are a few tantalizing loose ends: a greedy stepson, shaky business deals, and other women whose lives are somehow connected to the dead man.

So Gwenn begins to snoop around a wealthy middle-class enclave in Queens, not far from where, thirty years ago, neighbors calmly watched the brutal murder of Kitty Genovese. It is now a safe and sheltered place whose green lawns and large homes belie the lives of the people who own them.

The perfect spot for murder...