Thereisn'tmuchcrimeinStoneleigh,Massachusetts,acollegetown,amountaingetawayforthequietlyrich.SowhenEdwardInman,ownerofStoneleighSentinelsecurity,getsalate-nightalarmfromthehomeofoneofhiswealthiestclients,DoyleCutler,hedoesaroutinecheckandthinksnothingmoreofit—untilalocalstudentclaimsthatshewassexuallyassaultedthatnightatCutler’shouse.　　Edwardsoonfindshimselfdrawnintothegirl'sstory,andhisinvestigationleadshimtohisoldgirlfriend,whoseteenagesonmayknowthetruthaboutwhathappenedthatnight.Securityisatimely,wry,andrivetingstoryofadultsandchildren,secretlivesandcivicculture,suspicionandsexualhysteria.