The Fire — Caroline B. Cooney

A Maine teenager fights to escape the clutches of her evil guardians once and for all in the thrilling conclusion of this spooky trilogy.

In just eighteen days the semester will be over, freeing Christina and her friends from the terrible Schooner Inne and the Shevvingtons, their creepy hosts during the school year. They'll leave the mainland for the safety of Burning Fog Isle for the summer -- and since the Shevvingtons may be moving out of town next year, the island kids could be free of them forever.

But then Christina begins sleepwalking, and doing odd things like leaving lit candles around the house, carrying around pockets full of matches, and doodling flames into her textbooks -- or so claim the Shevvingtons. Can Christina survive their insane tricks until the school year ends? Or will they use all eighteen days to make Christina's life a living -- and fiery -- hell?