Medusa's curse

When geology-mad Sam goes to stay with her American cousin, Trey, neither of them have any idea what adventures they're about to unleash. They bring together two pieces of The Heart of Light and -whoosh! - they're thrown back into Ancient Greece, where angry harpies and satyrs live. That's not all - they've been set the challenge of saving the world from destruction. But first, they need to rescue an enchanted fragment of The Warrior's Shield, protected by a deadly mythical creature, Medusa.