When PhD candidate Glen Harrison proposes researching the origins of the earliest known tarot cards, the Visconti-Sforza deck, for his thesis, his art history professors are dubious. As he struggles to find a convincing argument, one of the cards yields a surprising clue. It is the first in a series of seemingly chance encounters and random finds that takes him down a new and terrifying path, which leads from the safety of the museums and libraries...