Andrew Clements

As Benjamin Pratt and his friends Jill and Robert continue their efforts to save their school, they find themselves dodging two evil janitors, Lyman and Wally, but their team has also grown and now has a secret fund of millions of dollars.

When fifteen-year-old Bobby wakes up and finds himself invisible, he and his parents and his new blind friend Alicia try to find out what caused his condition and how to reverse it.

Fifth grader Jack finds himself the target of ridicule at school when it becomes known that his father is one of the janitors, and he turns his anger onto his father.