For Annie London, a month in a Central American rainforest means handing out mosquito nets, giving medical aid, and teaching children about the birds and the bees. With any luck, it will also land her application in the "accepted" pile at a top-tier medical school. But as soon as she steps off the plane, Annie realizes her bug spray, feeble Spanish, and medical supplies won't help her deal with her new feelings for Felipe--her best friend's older...