From the bestselling author of The Shallows and The Rip comes a terrifying survivalist thriller as two sisters navigate the eerie Tasmanian wilderness, perfect for fans of Jane Harper and Yellowjackets.

Don't stop until you find me.

When their brother Pete went missing two years ago on Mount Mercy, officials shook their heads. ';He never should have been here; he was warned. Mount Mercy takes things.' After a disastrous first attempt to locate him, they called off the search.

Estranged sisters Hallie and Gertie are drawn back together when their mother's dying wish is for her girls to find their brother. To bring him back home. Their brother was last seen at a mysterious commune at the foot of the mountain, where members perform strange rituals to keep a sinister presence that comes from deep in the woods at bay.

But this mountain has no mercy, and they shouldn't be there either.

The sisters must navigate treacherous terrain as they confront what lies between them and what lives on the mountain. When Gertie also vanishes, the line between reality and nightmare blurs. Hallie realizes she must face Mount Mercy, and whatever is lurking in the forest, all alone.