When 5 of the 7D go missing, it's up to both Doc and Grumpy to save them from the only place they can guess... the floating territory, a giant, floating cave that sends people (especially dwarfs) to do their bidding.
Read first two before this one!
After the new girl, Weilan a Chinese mermaid and the crew escapes the clutches of an age old water dragon the team is spilt apart and pulled back together by Serena, who has gone missing after leaving with her sister.
They try to find her but end up meeting an enemy they weren't expecting.