Based on the hugely successful toy-line and TV show, the books of Ninjago follow the continuing adventures of Cole, Zane, Jay and Kai and their Sensei Wu. Unlike his fellow Masters of Spinjitzu, Zane is not human. In fact, technically he's very similar to the Nindroids - the ninjas' newest enemies! So what will happen when Zane, feeling alone and apart from his teammates, is invited to join the Nindroids? Will Zane betray his friends?