"The Dragon Machine" by Helen Ward

For a long time, dragons were ignored and overlooked . . . just like George. But one rainy Thursday, lonely George sees his first dragon. From that moment on, George's new friends follow him everywhere. They get him into all sorts of trouble, too. The dragons need to find their way home before they're noticed by other people, and George is the only one who can get them there. A child's imagination is the gateway to magic and freedom in this beautiful story from the creators of The Tin Forest.