Seb is an asshole. Katie is an angel.
When Seb's night-time activity stretches their relationship to its limits, they couple decide to take a last-chance holiday to see if there's anything left to be fixed.
The cabin looks idyllic, but behind the soft furnishings and fluffy throws there's a creeping sense of unease.
They thought they were fighting for their relationship - will they end up fighting for their lives?