In 1999, Michael Matthews became the youngest Briton to summit Mount Everest. But three hours after he summited, he disappeared and was never found. Twenty-three years later, his brother, entrepreneur and broadcaster Spencer Matthews sets out on a journey to find him. Teaming up with 14 peak record holder Nims Purja, the recovery team faces extreme challenges as the weather closes in.This film contains scenes that may be disturbing to some viewers. Viewer discretion advised.