When Rob receives a call in the middle of the night, he knows it must be bad news. But he isn't prepared for what he hears; his brother Marcus has died in Scotland, at the Systematics compound where they spent their childhood. The place Rob managed to escape with his sanity barely intact, the place that hollowed out his family.

Rob is determined to go north to the compound to see Marcus laid to rest, and more importantly, to get to the bottom of what killed him. Because Rob has been waiting for the Systematics to make a mistake. Waiting for their charismatic leader Bjorn Thrissell to show his true colours, so that Rob can make their crimes public.

But when Rob arrives at the compound with an eager podcaster, Lucy, in tow, they discover a group of people coming apart at the seams and paranoia seeping through the community. Mutiny is in the air and worse... there is something lurking under the surface, something monstrous and murderous, something that has been biding its time in the margins...

Trapped and isolated, Rob and Lucy are going to have to put their trust in the community they have come to ruin if any of them are going to have any hope of survival.