Philip Marshall [Charles Laughton] is a kind, henpecked manager who befriends Mary Gray [Ella Raines], a young stenographer who comes to him seeking work. He gradually finds himself falling in love with her, but keeps the relationship platonic, choosing to protect what he perceives as the proper boundaries of his life and status.
Marshall's wife Cora [Rosalind Ivan], who has also alienated their son with her sharp temper and controlling ways, discovers the affair. When Marshall asks for a divorce, arguing that they would both be happier apart, Cora refuses and instead threatens a scandal that could ruin them both. To shield Mary’s reputation, Marshall ends the relationship and cuts all ties with her; despite his best efforts to reconcile with Cora, their marriage remains brittle and strained.
Cora's death soon follows—she falls down the stairs at home. It is strongly hinted that Marshall was involved, though the circumstances make the death appear accidental, leaving room for doubt and moral ambiguity about his true nature.
Inspector Huxley [Stanley Ridges] of Scotland Yard suspects foul play but lacks concrete proof or a clear motive. He canvasses Marshall’s neighborhood, gathering impressions from people who knew the couple and Mary Gray, and threads together a picture of a man who once seemed decent and upright. When Huxley finally seeks to interview Mary directly, he learns a startling twist: Mary and Marshall were married earlier that day, making it impossible for her to testify against him and complicating the inspector’s pursuit of a straightforward case.
Meanwhile, Marshall’s drunken, spendthrift neighbor Gilbert Simmons [Henry Daniell] becomes entangled in the inspector’s suspicions and relishes the chance to blackmail Marshall, envying the latter’s outward respectability. Simmons threatens to fabricate a story about an argument between Marshall and his late wife, which could be used to taint Marshall’s character and motives.
In a desperate bid to protect himself, Marshall poisons his neighbor by administering an overdose of anodyne drops from a bottle that Simmons’ wife had previously shared with him. The act marks a turning point in a carefully balanced dilemma between desire, loyalty, and legality, intensifying the moral gravity of Marshall’s choices.
As the case spirals, Marshall and Mary plan to move to Canada so they can follow Marshall’s son, who has recently secured a position there. The inspector’s trap hinges on Marshall’s willingness to come forward, rather than let an innocent woman bear the blame. The tension sharpens as the stakes rise: will Marshall reveal his guilt to spare Mary and the memory of his own decency, or will he cling to a facade of propriety at the cost of truth?
The climax culminates in a poignant, morally complex resolution. The film ends with Marshall’s wife and son sailing to Canada, while Marshall disembarks at the last moment, a silent, ambiguous choice hanging in the balance—an inward moral reckoning that leaves the audience contemplating the nature of justice, responsibility, and the limits of personal honor.
