详细介绍：A mathe maticia n and a uthor, Luke W illiams, i s travelling up to Lond on on a train when he m eets a old lad y, Lavinia Fullerton, wh o is also g oing to London, to Scot land Yard. La vinia tel ls Luke th at in her sm all village s everal peopl e have died. The loc al poli ce are certai n that it was all accide ntal and are taking no ac tion but Lavinia isn&#39 ;t convinced. In Lon don Luke watches, hor rified, as Lavinia is run over in a hit and ru n and he become s convinced th at she w as telling the truth. He t ravels down to the vil lage and w ith the aid o f a loca l girl, who is al so convin ced that the deat hs were murder, sets out t o solve the mystery.详情