Just a quiet, peaceful summer cataloging magical creatures on New Firefly Island. Easy, right? Raine Campbell and her friends arrive to team up with another school to tackle the Magical Multitudes Project, ready for a little fun during the school break. But the island is full of secrets and creatures not normally found on Earth. And the island doesn't stay quiet for long. Earthquakes plague the area, and Raine even thinks she sees other people on the island—people who aren't supposed to be there. When the students find a dead creature, they finally know for certain—there's trouble on the island. Can they find out who's responsible and stop them before more animals are harmed? Are they in danger?