Lizzie and the Big Lake Mystery

In this third installment of the Lizzie books, we find an older Lizzie Lipinski ready to work away from her family for the summer. After working for the Wrightway family's hotel for a few weeks, and making their son Peter's acquaintance, Lizzie secretly discovers a mystery in the turret room of the hotel. She enlist Peter's aid to solve it in a daring way. Can Lizzie and Peter succeed in their plan to expose the mystery of the hotel and change the Wrightway family forever?