Derek and his friends decide to join a local martial arts school to learn how to be ninjas.  When someone starts vandalizing their school with graffiti of a mischievous troll-like creature, these ninjas-in-training are convinced they ‘ll be able to crack the case.  But it turns out that being a real ninja is a lot more work than they thought. Add the challenge of putting on the class Revolutionary War play, and Derek may have more than he can handle!  A perfect choice for Wimpy Kid devotees and anyone who thinks reading can’t be fun.