Raleigh Harmon just won a coveted science contest, with the chance to compete for a $50,000 college scholarship. Great news, right?Only her goofy aunt drives her to the contest held on Ocracoke Island, North Carolina, and as soon as they arrive, Raleigh realizes she's way out of her league. The competitors are ruthless brainiacs, and she doesn't have the slightest clue how to solve this new science challenge.That suddenly changes when one of her competitors is targeted in a near-death attack—and Raleigh looks like a suspect. After getting involuntarily partnered with a teen marine biologist, Raleigh's got forty-eight hours to solve the science riddle. But can she also pick out the bad guy—or girl—before they escape the island? And what if the bad guy is the boy she really likes?Stone and Sand is the third book in the Raleigh Harmon mystery series introducing the girl who will become a forensic geologist and FBI agent—provided she survives the high school years.