The Last Ninja- Ninjago.

(COMPLETED BOOK) Something horrible has been happening to the ninja. With the overlord gone, the ninja had expected a good break. However, they been disappearing slowly and mysteriously. Even Nya and P.I.X.A.L aren't safe! Bit by bit they disappear till Kai is the last one left. He's brave, he's strong. But he's worried. And without Cole's leadership guidance, he feels more lost than ever. But he has to remain strong and put his team of brother-like friends back together, alive.