Imagine you're 14 and in a strange country with your camera, your best friend, her guitar and her dog. You uncover a secret and are instantly in danger. Join Baggy, Abigail and Curly Connor as they explore Elfin Pond, sneak around Bar Gundoom Castle and row across an underground lake. The powerful Heartstone of Arden-Goth is hidden nearby, and corporate giants unleash a spy to seize it. Compelled to unmask the spy and find the Heartstone, they can't trust anyone. As summer heats up, their troubled friend Christopher is viciously bullied and an armed stranger terrorizes Abigail and Baggy. The friends disagree about the spy's identity, but are convinced it's a teacher. When a desperate Christopher shows up one night with a terrified cat, the truth is revealed. Soon, police are involved.