This is an avuncular story which goes along quietly until you realize that the narrator, Mr Heming, a real estate agent, has kept keys to every house he has ever had dealings with and he indulges himself with visiting the houses and sampling the lives of their occupants. For example, he goes to one house every day for breakfast after the family has left. They are in such a muddle that they wouldn't notice extra toast has been used. Gradually, we learn more of his history, and then learn what he is capable of when he is threatened. He is in danger of losing his carefully acquired poise and good humour, not to mention several clients and employees! Macabre and darkly funny, a very unusual and different mystery which would not be for everyone.