A mathematician and author, Luke Williams, is travelling up to London on a train when he meets a o[展开全部]
Amathematicianandauthor,LukeWilliams,istravellinguptoLondononatrainwhenhemeetsaoldlady,LaviniaFullerton,whoisalsogoingtoLondon,toScotlandYard.LaviniatellsLukethatinhersmallvillageseveralpeoplehavedied.ThelocalpolicearecertainthatitwasallaccidentalandaretakingnoactionbutLaviniaisn'tconvinced.InLondonLukewatches,horrified,asLaviniaisrunoverinahitandrunandhebecomesconvincedthatshewastellingthetruth.Hetravelsdowntothevillageandwiththeaidofalocalgirl,whoisalsoconvincedthatthedeathsweremurder,setsouttosolvethemystery.[收起部分]