It remains the most valuable -and confounding- art heist in history : 13 artworks stolen from Boston’s Isabella Stewart Gardner Museum. Twenty-eight years later, not a single piece in a haul worth half a billion dollars has surfaced. The art, and the thieves who made off with it, remain at large. With first-ever interviews, unprecedented access, and more than a year of investigative reporting, Last Seen takes us into the biggest unsolved art heist in history.