Amathematicianandauthor,LukeWilliams,istravellinguptoLondononatrainwhenhemeetsaoldlady,LaviniaFullerton,whoisalsogoingtoLondon,toScotlandYard.LaviniatellsLukethatinhersmallvillageseveralpeoplehavedied.ThelocalpolicearecertainthatitwasallaccidentalandaretakingnoactionbutLaviniaisn'tconvinced.InLondonLukewatches,horrified,asLaviniaisrunoverinahitandrunandhebecomesconvincedthatshewastellingthetruth.Hetravelsdowntothevillageandwiththeaidofalocalgirl,whoisalsoconvincedthatthedeathsweremurder,setsouttosolvethemystery.
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