Gordon is an ex-lighthouse keeper on the Dover coast, who is reluctantly seeing out his days tending to sightseers at his now dormant lighthouse. When a British Afghan student named Musa is hired as his apprentice, the young man's infectious charm and enthusiasm begins to rub off on Gordon, giving him a new lease on life. However, he soon comes to realise that Musa has ulterior motives for being there, that will throw into question Gordon's long held beliefs and his hardwired sense of duty.