Innocent in Death by Nora Roberts writing as J.D. Robb

Second Hand 

When history teacher Craig Foster is found dead in his classroom, his young wife is devastated, and his family, friends and colleagues all shocked. The two ten-year old students who discovered his body may be traumatised for life.

Magdalena Percell, an old flame of Eve's billionaire husband Roarke, has turned up in New York, and she's anything but innocent. Unfortunately, Roarke seems blind to Magdalena's maniuplations, but not to her shapely figure and flirtatious ways. But Eve will have to put aside her potential heartbreak, for a while at least- because another man has just turned up dead...