The murder of Roger Ackroyd：a Hercule Poirot mystery the mystery of three quarters :: the new hercule poirot mystery / The mystery of three quarters：The new Hercule Poirot mystery the a.b.c. murders :: a hercule poirot mystery / Death on the Nile：a Hercule Poirot mystery The mystery of three quarters :: the new Hercule Poirot mystery / the murder of roger ackroyd / The monogram murders：The new Hercule Poirot mystery The mysterious affair at Styles：the first Hercule Poirot mystery the murder of roger ackroyd