A mother and daughter stranded in Yosemite realise they are lost in more ways than one. When Sadie Harlan visits her daughter, Lauren, at her summer internship in Yosemite National Park, it seems like the perfect way to forget about her empty nest and failing marriage back home. But when the two women get lost on what’s meant to be a short hike, they suddenly find themselves fighting for their lives. As they search for food, water and civilisation, they battle injury, exhaustion and natural predators. Sadie, however, is assaulted by more than just the unforgiving elements. She lost her first child years earlier in a tragic accident, and in her sorrow, she’s pushed everyone away – including her husband. Now, Sadie must face her past through a journey of love, loss and learning to forgive herself if she and Lauren are to stand a chance at getting out of Yosemite alive. Will a mother’s courage be enough to save them both?