On an uninhabited island 20 miles from the rugged Scottish coast, three lighthouse keepers arrive for their 6 week shift. As Thomas (Peter Mullan), James (Gerard Butler) and Donald (Connor Swindells) settle into their normal quiet routine, something unexpected, potentially life-changing occurs – they stumble upon gold. Where did it come from? Who does it belong to? A boat appears in the distance that might hold the answer to these questions – What follows is a tense battle for survival, fed by isolation, paranoia and greed, leading three honest men down a path to destruction.