Have you seen Mikki Olsen?

"Penguin has a favorite stuffed animal named Mikki Olsen. Whatever Penguin does, wherever Penguin goes, Mikki is always right there next to him. After a very tiring day, Penguin rushes to bed. When he wakes up, Mikki has vanished! But can you find where he might be? A calming, reassuring story about lost things hiding right under your nose"--Provided by publisher.