Billie was a teenage runaway from Northern California who took up with a group of environmental activists wanted by the FBI. When she met Jonathan, a tech magazine editor and all around good guy, she settled easily into the life of an eco-conscious, stay-at-home suburban yoga mom. Now their daughter Olive needs less attention, so Billie throws herself into extreme sports-- marathons, scuba diving, rock climbs, solo hikes. On one of these expeditions Billie vanishes from the trail, and a year of intense mourning passes. Jonathan drinks; Olive grows remote. But then she starts having waking dreams, and Olive begins to believe her mother is still alive-- and in trouble.