A subject not often broached in children's books: parental depression through a child's eyes.

"Be nice! Something's bugging Mom!" Dad’s words echo in the little boy’s head. He wonders why Mom is sad. He asks everyone around him, but each person has their own different version of Mom's bug. No two descriptions really seem to match. Eventually, he comes up with a solution: fight the bug! The "secret mission" is now on, and the little boy turns into a brave knight, ready to face the terrible insect!