When her dad is kidnapped by a woman with a giant hamstoceros, Bitsy and best friend Kosh are swept into a secret world of ancient meteorites and strange beasts called magicores, each conjured using a different emotion. Using a powerful bestiary called Magicalia, the friends must quickly become conjurors themselves, before following a trail of clues that will take them from London to India to Paris, in a race to rescue Bitsy's dad from a mysterious villain.