Niles just finished The Mystery on Alaska's Iditarod Trail by Carole Marsh. He had it figured out by the very end and was pleased w/himself. He really enjoyed the book and I would recommend it. It has lots of facts about the race, the dogs, and Alaska woven into the story. It made a nice addition to our study of the race.
She has a whole series of mysteries that take place all over the world, in real locations she has visited and researched. I know we will be checking out more of them! I got this one from our local library.