Fifteen-year-old Raleigh Harmon finally conquers her worst fear—by trespassing—and can't wait to tell her best friend, a smart-mouthed physics genius girl named Drew Levinson. Only Drew's gone. Really gone. Everybody says Drew ran away. But that only skyrockets Raleigh's suspicions. Drew Levinson is the least impulsive person she knows.Armed with her rock hammer, an encyclopedic knowledge of city criminal codes, and a stubborn streak wide as the Chesapeake Bay, Raleigh scours her hometown for clues. But not even the cops are on her side.Was Drew meeting somebody in secret? Escaping her loony parents? Or is Raleigh's hunch dead-on: her best friend didn't choose to leave.Stone and Spark is the first 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.