The heroes in Peter Cheyney's books, for example, never cease to be amazed by women's unpredictable caprices; one can never guess how they will behave, they confound all calculations; in truth, as soon as the workings of their actions are exposed to the reader, they are seen as very simple mechanisms: this one is a spy or that one a thief; however clever the intrigue, there is always a key, and it could not be otherwise, even if the author had all the talent, all the imagination possible.