Hi, I'm Arnold. I'm one of the kids in Ms. Frizzle's class. I knew we were in deep when Ms. Frizzle announced our unit on ocean life, and I was right. On our field trip, we ended up underwater and face-to-face with all kinds of sharks, from great whites to goblin sharks. Then, then swimming in trouble, you'd never guess who helped us make the Great Shark Escape!
When a girl's face appears, then disappears, outside a window of their spooky old schoolhouse, the cousins think they've seen a ghost. More strange clues-piano music lilting through empty halls, a secret passageway, and an old portrait that looks like the girl from the window-make Jeff, David, and Claire begin to wonder: Is their school just spooky, or could it be...haunted?