In Marry for Murder, the tranquility of a couple's life on the Cape is shattered by a chilling murder plot that unfolds against the backdrop of ominous foghorns. The story centers around Philip Alden, a lawyer who becomes increasingly suspicious of Letty Hawthorne, a nervous newcomer with a tragic past. The narrative begins with Philip reflecting on his first encounter with Letty at a Sunday night supper hosted by a mutual friend. Letty, a charming yet fluttery woman, captivates Philip, but he soon senses an unsettling aura surrounding her. As fog envelops the Cape, the sound of foghorns becomes a haunting reminder of the dark events to come.