Meet Max Mulligan, a creative superhero sporting a red cowlick who loves to wear the initial "M" on his shirt. He tries to remain invisible in class. Beyond saying his name, he hasn't uttered another word. Today, he faces his biggest fear. The students in Miss Emy's class are learning the alphabet, and it's his turn to say "W." It comes out "Wubble You." Laughter erupts, and his new nickname is born.

Max doesn't like being called "Wubbles," but no matter what he does it doesn't stop the others from making fun of him. Determined to take a stand, he declares that if he can't say "W," no one can.

When all of the w's in the school turn up missing, the members of the Westchester Library Club become young crime fighters; with the help of Sheriff Jack DoGood.