Big four. Agatha Christie. [n. d.].

A sinister man, a multimillionaire, a beautiful Frenchwoman and ‘The Destroyer’ are terrorising the world with their fiendish genius. Only Hercule Poirot’s sensational methods of deduction can stand in the way of world domination, and after adventures as strange as the Arabian nights, Poirot runs them to earth at last in a cave in the Dolomites.