Seventeen-year-old Quinn provides closure to grieving families by taking on the short-term role of a deceased loved one, until huge secrets come to the surface about Quinn's own past.

The magic tree house is back with a message from Morgan le Fay telling Jack and Annie to seek out "The Gray Ghost" and listen to her story, and immediately they are whisked away to Nepal where they meet Tenzin, a climber who has recently lost his family, and who takes them up the mountain to meet a snow leopard and renew himself.