Ghostwater

Ghostwater is probably the best so far of the Cradle series. Liden, Orthos and Little Blue are trapped in a pocket dimension full of treasures and dangers of all kinds. If they can survive however it can greatly boost their advancement. Outside Mercy and Yerin must navigate the dangerous factions as they try to advance themselves and find another way inside the Ghostwater to save their friend.

Pretty well written and the new characters introduced are a wonderful addition thus far.