Book Summary

The Clue hunt is over, but Amy and Dan's adventures have just begun. Cahills across the globe have been kidnapped by a new enemy, the Vespers, and it's up to Amy and Dan to perform a dangerous ransom - a race that will take them from the hidden tunnels of the Roman Coliseum to the ancient city of Timbuktu. If Amy and Dan can't stop the Vespers... the whole world will pay. The enemy is coming. Are you ready to save the world?