Life on a remote island is turned upside down by a stranger's arrival, testing bonds of family and tradition and leaving a young dreamer's future hanging in the balance.

It's no ordinary existence on the rugged isle of Muckle Flugga. The elements run riot and the very rocks that shape the place begin to shift under their influence. The only human inhabitants are the lighthouse keeper, known as The Father, and his otherworldly son, Ouse. Them, and the occasional lodger to keep the wolf from the door.

When one of those lodgers - Firth, a chaotic writer - arrives from Edinburgh, the limits of the world the keeper and his son cling to begin to crumble. A tug of war ensues between Firth and the lighthouse keeper for Ouse's affections - and his future. As old and new ways collide, and life-changing decisions loom, what will the tides leave standing in their wake?