The boy and the bear
(Book)

When a lonely little boy receives an invitation to play written on a paper boat, it seems that he has finally found the best friend he's been longing for. But Bear isn't quite the playmate the boy had imagined. Bear may not know how to play games, but when he starts to build a tree house, the boy is intrigued and a magical summer begins. As autumn passes and the first winter snowflakes start to fall, the boy is left alone. Only then does he truly realize how much he misses Bear. It's a happy reunion when Bear finally returns in the spring. -- from Amazon.