The adorable mouse siblings are back in this new TOON comic for younger readers. Penny tries to help her brother Benny find his favorite hat, but Benny warns her that he is in a bad mood.

Benny wants to play pirates without his little sister Penny, and so he tries to get rid of her, but when Penny really disappears, Benny is worried.

Two mice meet their new neighbor and discover that she is not as scary as they feared.

When their cousin Bo comes to visit, Benny and Penny hide their toys and try to go on a treasure hunt without him, but Bo will not stop pestering them.

Penny the mouse tries to help her brother Benny find his favorite hat, but Benny warns her that he is in a bad mood.

Geoffrey Hayes, winner of the Geisel for Benny and Penny in the Big No-No!, tells the story of two tiny mice who learn what it takes to be a leader. School Library Journal declares, "Once again, Hayes has created a graphic novel that is inviting, relatable, but, most importantly, fun."

Previously published: New York: Doubleday, 1993.