AntonioandNikolaareinseparablefriendswholiveacrosstheroadfromeachother,andsharealoveofpyrotechnicsandmobilephones.Theirfamilieshavebeenindisputeforyearsoveraneasilyresolvableproblem:thewaterthatflowsfromthetophousetothebottomhouse.Theboys'friendship,astheyareabouttoenterpuberty,isputtothetestatChristmastimewhentheirfamiliesuncovermuchmoredangeroussecretsandinterests,andthewaterjustcarriesthehateoftheadultstothechildren.Debutfilm.