Need You Dead (Roy Grace #13), Peter James

Lorna Belling, desperate to escape the marriage from hell, falls for the charms of a man who promises her the earth. But, as Lorna soon finds, life seldom follows the plans you’ve made.

When the body of a woman is found, Grace is called to the scene. At first it looks an open-and-shut case with a clear prime suspect. That is, until Grace realizes there is a darker, far more terrifying alternative . .