Need You Dead (Roy Grace)

What does it take for a decent man to turn into a killer? Greg, a married man, has been having an affair for three years with another man's wife. One evening, after a fight with her at their rented love nest, he storms out. When he returns an hour later she is dead. Did he kill her in a fit of rage and blank it out, or did someone else do it while he was out of the building? Detective Superintendent Roy Grace of the Sussex Police, assigned to the case, soon discovers that there is more than one person who had a reason to kill her. But only one man has the most to lose--and when his marriage and career are at stake, what lengths will he go to protect all that he holds dear? And what will he do next?