The first three novels of the Agatha Christie's world of murder-mysteries! THE MYSTERIOUS AFFAIR AT STYLES Agatha Christie's first ever novel. With impeccable timing Hercule Poirot, the renowned Belgian detective, makes his dramatic entrance on to the English crime stage. THE SECRET ADVERSARY Agatha Christie's first Tommy and Tuppence mystery adventure. Tommy and Tuppence, two young people short of money and restless for excitement, embark on a daring business scheme – Young Adventurers Ltd. Their advertisement says they are 'willing to do anything, go anywhere'. But their first assignment, for the sinister Mr. Whittington, plunges them into more danger than they ever imagined... MURDER ON THE LINKS An urgent cry for help brings Poirot to France. But he arrives too late to save his client, whose brutally stabbed body now lies face downwards in a shallow grave on a golf course.