The Edge — Agatha Christie

Previously published in the print anthology The Harlequin Tea Set and Other Stories.

Claire Halliwell lives a quiet country life with her dogs. A conscientious and popular parish worker, she takes everything in her stride -- even when Sir Gerald Lee, the man she loves, marries Vivien, a glamorous city girl. When Claire learns that Vivien is having an affair, her sense of duty to Gerald is stretched to the limit!