Age Level: 9 and up | Grade Level: 4 and up. My name is Chase Cooper, and this is my second diary as a 6th grade ninja. It's only been a month since my last entry, but in a school as crazy as mine, a month is an eternity. My school recently had a day where everyone talked like a pirate, but it didn't stop after that! It became worse as the week went on, and pretty soon there were rumors of a massive pirate invasion. I ignored the warnings because I thought they were a joke. Turns out... I was wrong. Now my entire school is in danger, and I'm the only one that can save it. Diary of a 6th Grade Ninja 2: Pirate Invasion is a funny thriller that's entertaining for kids, middle school students, and adults.