The Hidden RoomThe Hidden Room

"After finding Mr. Summerling's secret tree house and forming the Treasure Troop, Marly, Isla and Sai are back on the hunt. With a new set of clues to follow, they turn to Mr. Summerling's house. With just a few scraps of paper as clues, secrets around every corner, and an unwelcome visitor, the hunt will be a challenge."--Provided by publisher.