Michael Kurland’s 1975 The Whenabouts of Burr is a standalone science fiction mystery novel.
Constitutional scholar Professor William Kranzler makes a momentous discovery. Someone has stolen the original American Constitution, replacing it with a very nearly identical copy. The copy has one flaw: where Alexander Hamilton’s signature should be, Aaron Burr’s signature appears.
President Gosport is determined to recover the document before his Republican foes (or worse, Democratic supposed allies) discover the theft. He can’t call on the FBI, because Gosport is utterly convinced that the FBI is out to get him. He also rules out every conventional law enforcement or intelligence group, believing there is no way to use them in this matter that would not end with a leak.
The President has an ace in the hole: he has quietly transformed the Bureau of Weights and Measures into his own private investigation agency. Thus, innocuously titled Field Observer Nathan Hale (Nate) Swift is handed the task of recovering the Constitution.