The Haunting of Hillside School

Book excerpt: It's a new school year in Cabin Creek, and the cousins have a new mystery! When Claire and David look out the art room window and see a girl's pale face, they suspect it's a ghost. How else could someone peek through a second-floor window and then just disappear? Rumor has it that the school building was once owned by a rich family, and it has a sad history. As the cousins investigate, they find other peculiar clues: piano music lilting through the halls, a secret passage, and a crooked painting that looks like the ghost's face. Is Cabin Creek's spooky old schoolhouse really a haunted house?