TwosisterslivingseparatelivesondifferentcontinentsarereunitedonaMediterraneanIslandThetwobarelyhavetimetobondandrevivefamilytiesasKate,theelder,meetsagroupoflocalsandagreestoanexcitingrideonahotairballoonButdisasterstrikesandastheresultofafreakaccident,theballooniscarriedfarouttoseaTheircellphonesoutofrange,andtheballoonrunningoutofgas,KateandherfriendsarebattlingfortheirlivesWhile,backonland,theyoungersister,Liz,hasbecomeanunwanted"materialwitness"toacrimeMattersthentakeadramatictwist,onethatwillmarktheirlivesforever