Delighted as she is with married life, Harriet has not cocooned herself away from the real world - she is still involved with running the local workhouse. When a letter arrives from Italy, Harriet's husband, Godfrey, starts behaving strangely. He makes a mysterious visit to London, where he meets up with Amelia Bianchi, a married woman with whom he had an affair in Italy years earlier. All Godfrey has done is to offer Amelia financial assistance - but Amelia wants more, and when she turns up at their house to claim Godfrey, Harriet is terrified - does Amelia really have the power to destroy her marriage . . . ?