The Detention Adventure group recoup after being sent out of school and into Miss Domounts house the gang realizes that there is a new adventure awaiting them.
As their detention punishment, Principal Lounsberry assigns the heroes to perform in a historical re-enactment under the watchful eye of shrewd local historian Miss Dumont.
The detention team follow their clue to a haunted church that supposedly reveals one's darkest fears; Kelly stays behind to keep a watch, but she may be keeping a secret of her own.
A bright star leads the wise boys and girls to a dusty antique store in search of the next clue. They must quickly decide whether the eerie shopkeeper is friend or foe as he teaches them a lesson outside school.
The fab five must team up with an old enemy to pull off a daring heist on the Historical Society; tensions run high when someone is a no-show, making the group leave their comfort zone.
Brett finds himself treasure-hunting solo while also attempting to get the gang back together. Gym class forces the group to reunite, and learn that a strong foundation is the key to any obstacle.