Someone has taken the original document of the U.S. Constitution and substituted another. The substitute is identical, just as old, and equally authentic -- except it has been signed by Aaron Burr! It contradicts history, but it is real and there for everyone to see!

Such a crime calls for out-of-this-world detective work. There must be alternate Americas -- and one of them must be an American union that Burr helped shape. With a few impossible coins, the path is indicated...and the search for THE WHENABOUTS OF BURR begins! It's a hunt through all the alternate-universe Americas that might have been -- with Alexander Hamilton to point the way and Aaron Burr to block it!

A classic science fiction novel combining future, past, and present in a super-science history mystery! Features a new introduction by Michael Kurland.