TwosisterslivingseparatelivesondifferentcontinentsarereunitedonaMediterraneanIsland.ThetwobarelyhavetimetobondandrevivefamilytiesasKate,theelder,meetsagroupoflocalsandagreestoanexcitingrideonahotairballoon.Butdisasterstrikesandastheresultofafreakaccident,theballooniscarriedfarouttosea.Theircellphonesoutofrange,andtheballoonrunningoutofgas,Kateandherfriendsarebattlingfortheirlives.While,backonland,theyoungersister,Liz,hasbecomeanunwanted"materialwitness"toacrime.Mattersthentakeadramatictwist,onethatwillmarktheirlivesforever.

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