Suspecting her husband of having an affair, a housewife pays a visit to Parker Pyne, a self-proclaimed expert in happiness. Part of his unusual treatment includes introducing her to a young French beau.

At an engagement party for a friend's sister, an army officer has a disturbing vision-and warns the young woman against the marriage. After returning from World War I, he finds her again and realizes the true meaning of his prophecy.

After losing his job, a young investment broker seeks some adventure in his life. He finds it on a train to Portsmouth when a beautiful blonde darts into his compartment and entangles him in international intrigue.

On the night train from London to Scotland, a lawyer, a clergyman, and a doctor discuss a celebrated case of multiple personalities. When a fourth traveler joins their compartment, he makes them question everything they once believed.

An army major returned from life abroad feels restless and bored in his new English village. He consults Parker Pyne to find the excitement and danger missing from his life-plus a little something extra.

Trapped in a marriage of convenience, Theodora Darrell falls into an unexpected romance. Torn between the man who loves her and the husband who needs her, Theo searches for the freedom she so desperately desires.