Trudy has betrayed her husband, John, who trusts and adores her. She's still in the marital home -- a dilapidated, priceless London townhouse -- but John's not there. Instead, she's with the profoundly banal Claude, and the two of them are hatching a murderous plan. But there is an unexpected witness to their plot, who cares deeply about the outcome: the inquisitive nine-month-old resident of Trudy's womb.