After three tours in Iraq, the fabric of Dave Cartwright's life has begun to unravel. Gripped by PTSD, he is losing his home, his wife, his direction. Most days, his love for his seven-year-old daughter, Bella, is the only thing keeping him going. When tragedy strikes, Dave makes a dramatic decision: he will take Bella to live off the grid, in a cave in the wilderness of the North Cascades. Once there, Bella retreats into a different world, that of a mother and son who had lived in that same space, but thousands of years before, at the end of last Ice Age.