In Castlebay, North Wales, Dick Merrill is on trial, accused of murdering his wife by administering a lethal dose of arsenic. Merrill, good-looking and attractive, is fatally in love with Margot Stone, who's herself already married. Philip Vane, a lawyer whose career was mysteriously ruined, finds himself similarly infatuated with Margot when he becomes personally involved in Merrill's sensational murder trial. A shadowy figure, Vane's participation in the trial is twisted and erratic—will the outcome be as unpredictable? A classic thrilling courtroom drama filled with unexpected twists and turns!