The Prophet (The Legend of William Oh Book 3)

The City of Akul is (sort of) saved, and Will and company have set their sights on the Sixth Floor.

Unknown to Will, the church of Granesh is moving against him, turning the Sixth Floor into a death trap. While he deals with fish-people, faux mermaids, and surprisingly altruistic crabs, a powerful Climber is dispatched to be his executioner.

Will is content to roll with the punches and escape by the skin of his teeth.

Until he learns the fate of an old friend.