The second installment of the Guardians Trilogy. Once more the chidren are called into action when the Earth's elements spiral out of balance. With the time out of joint, Long Wittenham returns to the Roman settlement of 'Verdonium' or 'Wet Town'. The Guardians join forces with the ethereal inhabitants of the Thames to try to outwit Roman soldiers and even the ancient God, Jupiter himself. Will the Guardians succeeded in their quest to 'Save the Earth on which we stand'' ? Local history and folklore intertwine in a gripping adventure story of modern-day children.