The Silence - Katharine Johnson

Doctor Abby Fenton has a rewarding career, a loving family, an enviable lifestyle - and a secret that could destroy everything.
When human remains are discovered in the grounds of an idyllic Tuscan holiday home she is forced to confront the memories she has suppressed until now and relive the summer she spent at the villa in 1992. A summer that ended in tragedy. The nearer she gets to the truth the closer she comes to losing her sanity.
In order to hold onto the people she loves most, she must make sure they never discover what she did. But the reappearance of someone else from that summer threatens to blow her secret wide open.