When their parents are torn from them life becomes a constant struggle for survival for Onas and the street children of Kryminster. When Onas finds a mysterious parchment, and Jules’ little sister is snatched away, an adventure begins that transports the orphans of Kryminster to a hidden world beneath the waves, a world where danger and magic lurk around every corner. They must win a race against time to rescue Figgle before it is too late and she becomes another victim of the vile Sable Thrasp.