Suppose every event in history had at least two causes. And led to and from a separate universe in space and time. Then there would be an infinity of alternate worlds. Imagine a world in which every word written by Shakespeare was literally true. A world in which Prince Rupert of the Rhine could fight for Charles I of England and escape the Puritans by hopping a railroad locomotive, on the right track but 200 years before its time. A world in which aging Caliban could pace the lonely shore, yearning for the return of his lost love, Miranda. And where all these universes, and more, intersected, there lay a tavern where infinite possibilities met--if only for a night!