Volume 31 in the Agatha Christie Collection (1938) Limited edition of 800 copies worldwide

Among the towering red cliffs of Petra, like some monstrous swollen Buddha, sat the corpse of Mrs Boynton. A tiny puncture mark on her wrist was the only sign of the fatal injection that had killed her.

With only 24 hours available to solve the mystery, Hercule Poirot recalled a chance remark he'd overheard back in Jerusalem: 'You see, don't you, that she's got to be killed?' Mrs Boynton was, indeed, the most detestable woman he'd ever met...