Twelve-year-old Katie is dreading the boring summer ahead until she realizes the mysterious neighbor who hired her to catsit is one of the city's greatest supervillains.
Twelve-year-old Katie now knows her neighbor Madeline is also the Mousetress, the city's most feared villain (or most misunderstood superhero), and she is ready to become the super sidekick she always wanted to be.
"Still training to be a sidekick, Katie protects the city against mysterious robot attacks--while trying not to feel like an outsider within her own friend group"--
