A wildlife volunteer on an uninhabited island off the British coast descends into a terrifying madness that challenges her grip on reality and pushes her into a living nightmare.

Martin Ward is a cove fisherman, without a boat. His brother Steven has repurposed their father’s vessel as a tourist tripper, driving a wedge between the brothers. With their childhood home now a getaway for London money, Martin is displaced to the estate above the picturesque harbour. As his struggle to restore the family to their traditional place creates increasing friction with tourists and locals alike, a tragedy at the heart of the family changes his world.