Is it murder, suicide or something even more sinister, and how watertight is the alibi of the husband Mark? Meanwhile, when Sally Thorne, a working mother with a husband and two young children, hears of the deaths, she is shocked and appalled. Months before she’d met Mark Bretherick at a hotel and had a brief but passionate affair with him. Now she feels the need to get in touch with him again to offer her sympathy. Her friend Esther does not think this is very wise.