美國聯邦調查員麥特班森帶著妻子寶拉與五歲的女兒蒂娜，被派駐到義大利西西里島的吉諾斯特拉火山（Ginostra），去保護一樁謀殺案的關鍵證人──一名11歲男孩艾托瑞。艾托瑞的家人在汽車裡被炸死了，他是唯一的生還者。麥特假意收養艾托瑞，希望能從艾托瑞口中問出內幕、指認兇手，卻悄悄洩露出隱藏在麥特與艾托瑞背後的悲劇，一個連妻子寶拉都毫不知情的祕密。祕密與謊言，像即將爆發的Ginostra般，麥特一家人正一步步通往地嶽之門。外在的危機，內在的恐懼，被遺棄的孤兒陷入兩難的泥淖……
　　
　　MattBenson,anFBIinvestigator,hasbeenpostedtotheislandofPanareaintheLipariarchipelagowithintheframeworkofanagreementbetweentheUSAandItaly.Hehasbeenallocatedacomfortable,well-protectedhousewithvastgroundsandaprivatecovefacingtheGinostravolcano.ThisdelightshiswifeJessieandtheir5-year-olddaughterTina.Afewdaysaftertheyarrive,a11-year-oldboy,EttoreGreco,aMafiavictim,isquestionedbyMattaboutthedeathofhiswholefamilyinacarbombing.Forsecurityreasons,MattdecidestobringEttoretothehousewhereheisliving.ThisartificialadoptiongraduallyrevealsthetragicsecretbindingMatttothechild,asecretJessieknowsnothingabout.Fromsecretstolies,theatmosphereinthevillaslowlyleadstheBensonfamilytothegatesofhell.Outsideisthedanger,insideisthefear.Inbetweenisanorphanchild...