What happens when your pet mouse won't stop growing? Billy Pitt's life is complicated enough--between juggling a paper round, fixing his bike, and staying out of trouble. But when he and his best mate Rusty uncover a strange grey box at the local tip, things go from ordinary to outrageous. Inside are two mysterious capsules, and after a slight accident, Billy's beloved pet mouse Marmaduke starts growing... and growing... and growing.

Soon, the once-tiny mouse is the size of a dog--and he's still not done. As chaos erupts and reports of a "tip monster" spread, Billy must find a way to fix his mistake before his oversized pet becomes a full-blown public menace. But who can he trust with the truth? And is there any way to reverse the effect?

Marmaduke is a fast-paced, laugh-out-loud middle-grade adventure about friendship, responsibility, and the accidental consequences of curiosity gone wild.

Perfect for readers aged 8-10 who love funny science fiction and clever kids who think on their feet.