Mandie's favorite teacher, Miss Hope, has gone missing.

Someone is going through Mandie's and Celia's rooms and Mandie's graduation dress is missing.

Mandie goes to Ashville, North Carolina to investigate the disappearance of Miss Hope, her favorite teacher.

In 1900, Mandie is searching her dead uncle's mansion for a missing will when she finds a secret tunnel and strangers who claim to be her relatives.

Mandie and her friends search for a hidden mystery in the tunnel behind a crack in the wall.