In 1587, 115 people crossed the Atlantic from England to establish a colony off the coast of North Carolina. But when the colony’s leader, John White, returned after gathering supplies, he found not a soul in the camp. Andrew Lawler joins us to talk about his attempt to solve one of the greatest mysteries in American history, which he writes about in “The Secret Token: Myth, Obsession, and the Search for the Lost Colony of Roanoke” (Doubleday).