What secret could be hidden in the one-room schoolhouse?Spring term at the Spirit Lake School had begun, and the one-room building is filled with the excitement of friends who have finally gotten back together again. But from the very first day, this spring term promises to be different than any other in the school's history.First, there's Ben, the brother of Kate O'Connell's mother. Although he's older than the teacher, he needs to learn English and joins Kate and Anders as school begins. At six feet three inches tall, Ben causes a stir with the school children and the teacher!Then, there's the strange sound that Kate hears above the noise of the first day's hubbub. Where did it come from? The ceiling above her desk? Or from beneath the floor? Could she have imagined it?A series of baffling clues that seem to make no sense have Kate, Anders, and Erik searching for answers.Is the only way to solve the mystery under the cover of darkness?