Christmas is only four weeks away, and Charlie's Sunday school class has been tasked with solving four riddles to complete a scavenger hunt and learn the meaning of Advent. But when items start disappearing from her front yard, Charlie and her best friend Harold have a real mystery to solve.

But all is not what it seems. The Advent scavenger hunt teaches Charlie more than she ever wanted to learn, while the real mystery seems headed for a dead end. In addition, Rudy's past is uncovered, Sarah's family secret revealed, and Harold's deepest desire disclosed.

Charlie's Christmas Adventure is all about friendship, family, growing up, and one very special gift.