The Smithsonian Institution [signed] [first edition]

It is 1939, and the U.S. is on the cusp of war when a teenaged science prodigy is summoned to the Smithsonian Institution. He becomes involved in a scheme to change history. The wax figures on exhibit come to life, while scientists in the basement experiment with time travel and nuclear physics. Among the characters our hero's encounters are a sexy 19th-century First Lady with whom he has a passionate affair, a slightly brain-damaged Abraham Lincoln, as well as Einstein and Hitler.