The late-medieval artist Hieronymus Bosch caused uproar 500 years ago with his fantastical and unique paintings. In preparation for a contemporary exhibition of his work, a team of Dutch art historians crisscrosses the globe to unravel Bosch's secrets, and to borrow his works. As they shuttle between world-class museums, they encounter a seemingly impenetrable tangle of red tape, ego, and conflicting interests.