The ABC Murders: Agatha Christie

"Look out for Andover on the 21st of the month..." The letter disturbed Poirot greatly. It was written by a killer in deadly earnest. Sure enough, a Mrs Ascher was murdered at Andover on the due date. A second letter announced a murder at Bexhill. The victim was Betty Barnard. And a third, at Churston - Sir Carmichael Clarke...followed by a fourth at Doncaster...Beside each corpse lay a copy of the ABC Railway Guide, open at the relevant page. Poirot is tested by the sinister logic of the ABC Murders.