Easy to Kill
Agatha Christie
Mass Market Paperback
(Pocket Books, March 15, 1965)
The book features one Luke Fitzwilliam, a retired police officer who has recently returned to Britain from the East. A mix-up with regard to his train to London leads him to share a carriage with one Lavinia Fullerton, a woman from Wychwood who is convinced that a recent string of accidental deaths are not accidents, but murder, and murder by only one person.