Friends come in all shapes and sizes, and sometimes the best friends are the most unlikely of all. When a lonely little boy receives an invitation to play written on a paper boat, it seems that he has found the best friend he's been longing for - at last! But Bear isn't quite the playmate the boy had imagined. If only he knew how to play games properly! Then, when Bear starts to build a treehouse, the boy is intrigued and a magical summer begins. As autumn passes and the first winter snowflakes ...