It's a dude ranch mystery! The Sleepover Friends are ready for some wild west adventure when they go on vacation at a dude ranch in Arizona with Stephanie's grandmother. But then Kate starts acting strange. . . like making excuses not to get involved with all the fun activities at the ranch. And she's not the only mystery person around. What is it about fellow guest Keith Foley? He's so unfriendly! He never smiles, either. So why is Kate always defending him? Stephanie, Patti, and Lauren can't believe it! Does Kate have a crush on Keith?