My friend George is competing in a grueling three-day mountain-bike race in Costa Rica, and her cousin Bess and I will be there as her support team. But when I find out someone's taking dangerous steps to make sure top U.S. cyclist Derek Woodhall doesn't win, I realize George may not be the only rider I need to help.

Could last year's winner be the culprit? He was freaking out when Derek took an early lead. Or maybe Derek's publicist? She seems a little too psyched about the press her client's misfortune is generating.

I've got a lot on my plate, and not much time to sort it all out. But I know how to keep my eye on the prize. Whoever the culprit is, they picked the wrong race to sabotage!