It's a parent's worst fear. Your children, all three of them, vanish in the wilderness. In 2015, three sisters, Megan, Erin and Kelsi Andrews-Sharer, embarked on what started out as a dream backpacking trip into the Gros Ventre Wilderness.

This is Part 2 of our story. Listen to Part 1 to hear how the sisters lose their way in the face of disappearing trails, endless river crossings, avalanche debris and dwindling food supplies.

In this episode, we talk with the sisters, their parents and a Search and Rescue volunteer about how the Jackson Hole community mobilizes to find them. The sisters have no way to call for help and have left few clues to pinpoint their location.