Kai's sister, Nya, is kidnapped and he must learn Spinjitzu from Sensei Wu, a mysterious old man, to rescue her.
- ISBN13 9780545401135
- Publish Date 1 February 2012
- Publish Status Active
- Out of Print 20 April 2021
- Publish Country US
- Imprint Scholastic US
- Format Paperback
- Pages 32
- Language English