Someone is setting empty barns on fire in the fields around Tackleford, and Linton and Sunny think this could be their next case. It's not nearly as fun to solve mysteries without Jack though, who has hardly been seen all summer now that he's dating Shauna. Charlotte and Mildred as similarly left to their own devices and in Shauna's absence they decide to domesticate the weird troll they found living under a bridge. He seems like a perfect man to set up with their new French teacher... if he's not the one setting all the fires, that is. Another pitch-perfect John Allison caper.