Oh my goodness.  I've spent the past several days reading these books for this publishing company I work for, and I haven't been able to read anything else (okay, I did sneak a romance novel in there somewhere;).  I can't comment on the quality of the books because of conflict of interest.  I will say that the books are for younger kids and because of that made reading them tedious.  I am so glad I'm finished with them.  I don't want to use them in my 100 book challenge, but just in case I get desperate and have to, I'm listing them here:

1. Mystery at the Biltmore House
2. Mystery on the Freedom Trail
3. Mystery of Blackbeard the Pirate 
4. Mystery of the Missing Dinosaurs
5. Mystery on the California Mission Trail
6. White House Christma Mystery
7. Mystry on Alaska's Iditarod Trail
8. Mystery at Kill Devil Hills