John, a 35-year-old window cleaner, has dedicated his life to bringing up his 4-year-old son, Michael, after the child's mother left them soon after giving birth. When John is given only a few months left to live, he attempts to find a new, perfect family for Michael, determined to shield him from the terrible reality of the situation.

The series follows a group of kids at an adventure camp who discover a strange artefact, while also drawn to the fate of four children who mysteriously disappeared twenty years ago.