Lesson one: Adventure Belle has been selected to join the secret ACE Academy! Here, talented kids are trained to become adventurers investigating and discovering the mysteries of the world. But Belle's barely arrived when a unique magical artefact is stolen right before her eyes! Luckily, she's not alone in uncovering the mystery - even though her classmates Oni, with her meerkat, Oliver the nerd and arrogant Connor seem quite odd at first. The four of them share a talent for getting into trouble, like stealing a talking supersonic zeppelin with a teacher inside... Before they know it, they're off on a dangerous adventure - and lessons haven't even started yet! The exciting start of a fast-paced adventure series: supernatural dangers, tricky puzzles, trips around the world and four cool heroes!