Summer is in session and that means all the neighborhood patrols, soccer games, and snacks the boys can handle. But things take an unexpected turn when a new group of heroes, known as the Hero Club, approach Damian and Howard with an unusual offer--an invitation to help unmask the corporation planning to build a recycling factory in their favorite park. Together, they hope to recruit the help of Metropolis's favorite reporter.

If that weren't enough, Batman has been acting strangely and disappearing for stretches of time. And there are ninja everywhere...What could possibly be going on?

Get ready for this laugh-out-loud sequel from beloved New York Times bestselling author-illustrator Jeffrey Brown.