The sun was already climbing high on that perfect summer weekend in late June, the kind where the air hummed with excitement and the promise of salty waves and sandy toes. Jake, 18 and fresh out of high school, had been counting down the days for this beach camping trip with his two best friends, Ashley and Erica—both 19 and inseparable from him since middle school. They'd rented a cozy trailer right on the edge of the be...