Good story about a tractor that was useful, but not to his full potential, until farmer Dave found the Owner's Manual. At the end of the story, the author discusses how the Bible is a person's Owner's Manual. My 3 yr old son loves the story of the tractor, nice pictures, and I love the message.
This series of books was recommended by a coworker. After seeing them offered all together for a good deal, I purchased them for my grandchildren. I started with this one and will get the other ones out as he grows up and starts to understand. They have such a good story line to apply to everyday Christian living that children can understand.