Santiago Torres, the Jesuit headmaster of one of Washington, D.C.'s top high schools, knows two truths. First, historian Jasper Willoughs, his closest friend, didn't toss himself off a dormitory roof. Second, a Georgetown University secret society-a running joke on campus-has blood on its hands. Torres's pursuit of the truth embroils him in a bizarre and deadly scavenger hunt. The clues, scratched out on parchment by the mysterious Odd Fellows Society,...