Sniff, sniff! went Mouse. Whiff, whiff! went Mouse. "Who left this poo outside my house? I must undo this mystery. Poo-dunit?"

Katelyn Aronson is a former children's bookseller and the author of several picture books. She grew up in California and now lives in France.
Stephanie Laberis is a character designer and illustrator who specializes in creating art for animation and children's publications. She is the illustrator of Orangutan Hats and Other Tools Animals Use as well as the Grumpy Cat books and many other Little Golden Books. Stephanie Laberis lives in the San Francisco Bay Area.