The gruesome death of Mrs. McGinty provokes Superintendent Spence to seek the help of his old ally Hercule Poirot. The victim's young lodger has been found guilty and is due to hang. But Spence is not convinced by the circumstantial evidence which influenced the verdict. So, at considerable personal discomfort, Poirot goes down to the sleepy village where the old lady lived and where, by chance, his good friend Ariadne Oliver is also staying ...