Best friends Horace, Morris, and Dolores are adventurous mice who do everything together: They "sail the seven sewers," climb "Mount Ever-Rust," and dare to go where no mouse has gone before. But everything changes when Horace and Morris join "Mega-Mice," a club that doesn't allow girls. They don't really want to be apart from Dolores, but as Horace points out, "A boy mouse must do what a boy mouse must do."
Left with no other choice, Dolores decides that "a girl mouse must do what a girl mouse must do," and resolutely joins the "Cheese Puffs," herself. Despite missing each other, Dolores and the boys each go to their respective clubs, day after day. Finally, Dolores decides she's had enough. While the other dainty members of the Cheese Puffs are discussing "how to get a fella using mozzarella," she boldly announces, "I'm bored." Sick and tired of making things out of cheese, and desperate to build a fort or do something adventurous, she quits the club. Ultimately, a girl named Chloris joins her, and together, they convince the boys to go exploring with them. The final page of the book depicts all of the mice together, in front of a new clubhouse where everyone is allowed.
Filled with bold, bright, humorous illustrations that complement James Howe's clever text, HORACE AND MORRIS BUT MOSTLY DOLORES is an empowering book for both girls and boys. It stresses the importance of being true to yourself and to your friends and reinforces the fact that girls don't always like doing "girl stuff" and that boys and girls can have plenty of fun playing together. Insum,this fresh and funny book encourages kids to do what they like to do rather than what others say they should like.