In a secret meeting in 1981, a master thief named Louis Royce gave career gangster Ralph Rossetti the tip of a lifetime. As a kid, Royce had visited the Isabella Stewart Gardner Museum and made a habit of sneaking in at night to find a good place to sleep. He knew the Museum's security was lax, and he gave this information to a boss of the Boston criminal underworld. It took years before the Museum was hit. But when it finally happened, it quickly became one of the most infamous art heists in history.