Mr. Harley Quin turns up mysteriously at a house party. It's dark and cold, with snow drifts everywhere, when Mr. Harley Quin appears at the door of Royston Hall stating that his car has broken down. There he helps Mr Satterthwaite clear up the mystery of a death which took place ten years before but continues to haunt some of those present.

Mr Satterthwaite attends a party at a house where all the guests are gossiping about the ghostly figure in the upstairs window: a cavalier, murdered by his wife's lover. But when a real murder takes place it is only through Satterthwaite's patient and observing nature that the crime can be solved.

Mr Satterthwaite attends the trial of young Martin Wylde accused of murder. Shortly after the guilty verdict is returned, Satterthwaite runs into his mysterious friend Harley Quin. Can they prove Wylde’s innocence or did he really kill the beautiful Vivien Barnaby? In this story he has to travel all the way to Banff in Canada to solve the mystery.

A man disappeared from a house in the village of Kirklington Mallet, leaving his wife and all their possessions. Satterthwaite and Quin talk through the details of the mystery and finally see it for what it was.

While visiting Colonel Melrose, Mr Satterthwaite hears of the murder of Sir James Dwighton, who had recently been in a messy love triangle and the wife and her lover are immediately suspected. But a chance meeting with Mr Quin, changes Satterthwaite's perception of the facts.

Whilst holidaying in the principality, Mr. Satterthwaite watches as a young American man falls in love with a mystifying Countess. Soon after a bit of gambling at which he was not successful, he bumps into Harley Quin and they invite their new friends for an intimate dinner that reveals dark secrets about one of the guest.

Mr Satterthwaite has come to Corsica with his friend the Duchess of Leith, where they meet the Duchess’s cousin Naomi Carlton-Smith. Distraught that her fiancé has been accused of stealing, Naomi turns to Sattherthwaite and his friend the mysterious Mr Quin for help.

Mr Satterthwaite investigates his friend's daughter, who appears to be hearing voices. Is it her imagination or is the sinister demand for something stolen a warning? Mr Quin glides into the picture, dropping clues and setting Satterthwaite's thoughts along the right path, as always leading him towards a resolution. In this story they again stay at 'The Bells and Motley', mentioned in an earlier short story of the same name.