Autism. imagination book

Someone suggested this book to me for help with developing imagination. It looks really cute, so I'm going to try to get a copy from the library.

This is the blurb:

Henry is a very serious boy. His room is always neat, and he always buttons his shirt right to the top. But lately Henry has been having thoughts that don"t make any sense, thoughts about pirates, dragons and rocket ships. Henry has caught imaginitis-and the only cure is to grow up. But what should Henry do in the meantime?