From the beloved creator of The Snowman comes an enchanting big book featuring 124 beautiful pastel illustration panels. A huge, snowy white bear arrives mysteriously one cold winter night and crawls into bed with Tilly. The next morning, Tilly sets about making her polar bear friend welcome and excitedly reports her progress in "civilizing" him to her bemused parents. They are sure Tilly has an imaginary friend. But is he imaginary? Whether or not, his story is irresistible.