Tomorrow in the Battle Think on Me - Javier Marias - Bog

Victor, a ghostwriter, is just about to have an affair with Marta, a married woman, when - in the bedroom, half-undressed - she drops dead in his arms. He panics and slips away. But Marta's family are all too aware that she was not alone when she died, and Dean, the widowed husband, is determined to find out who was sharing her bed that night.