Grandpa, What's That Sound in the Middle of the Night?

In this delightfully illustrated picture book, two curious and courageous children seek out the source of a sound in the night. Along their journey of imagination they meet fanciful creatures—including a herd of hippos, monsters, a flying cow, and more. Even grandpa can’t help them find the answer, as he is unknowingly the one creating the sound with the roar of his own snoring.