I can't decide if it was the storyline or the illustrations, but this book sort of gave me the creeps. I've only ever read one other Van Allsburg book (The Polar Express) and I have much more positive feelings toward that book even though the illustrations have a similar quality. Perhaps it's because the that story is so magical and ends with Christmas?
This story is about a farmer who is driving along on a beautiful, late summer day when suddenly he feels a thump. When he investigates, he realizes that he hit a man, not a deer as he suspected. He brings the man to his home and has him examined by a doctor who determines that the man must have short term memory loss that he believes will resolve. The man cannot speak, but as the days and weeks pass, strange things happen, most notably that fall has not arrived and all of the trees around the farm remain green. One day, the stranger has a realization (though the reader never learns exactly what it is) and he departs from the farm, never to be seen again.
The story is a mystery, which might appeal to many readers, but because the mystery is never resolved, I didn't love the book. Some readers might love that its up to them to solve the mystery, but I was really hoping for some resolution. That said, I think that this book would be a great way to teach the reading skill of inference: using clues in the story to try to solve the mystery. I think this story would best be used with older students (upper elementary) as they would be more efficient at finding "real" clues as opposed to things that aren't really meant to be clues. A concept map or story web might be a good tool to use when teaching inference with this book. In addition, this book might be a nice addition to a nonfiction writing unit if students are writing about interesting characters or trying some strategies in their writing like leaving an open ended ending.