No Girls Allowed (Dogs Okay)

"This chapter has nothing to do with my pants."

So begins the story of Scab McNally, a fourth grader with a mission. Part inventor, part daredevil, Scab is determined to let nothing get in the way of convincing his parents to let him buy a dog -- especially his "smart times ten" twin sister, Isabelle.

When his newest invention, a sister-repellent spray (aka Isabelle's Smell), becomes a hit with the guys, Scab hatches a plan. He'll earn enough selling Isabelle's Smell to buy a dog, and...