The Submerged City and the Orb of Earth

With David's grandfather recovering, the group, now joined by Cagen, travels to the port city of Rain, a place of secrets and betrayals. They discover that the Orb of Earth lies in a submerged city, accessible only during low tide.

As they unravel the mysteries of Rain and evade Silver's spies, they meet Jug, a kind-hearted giant with immense strength, who joins their cause. The group's trust is tested as they face the dangers of the depths and the intrigues of the surface.