Smart Moves: a Toby Peters mystery by Stuart Kaminsky

In ten words or less: Peters is hired to prevent assassination of Albert Einstein.

Review: It's World War II and a group of Nazis is setting up Albert Einstein as a traitor, hoping to assassinate him and black actor Paul Robeson. Einstein hires Los Angeles private detective Toby Peters to investigate and prevent the attempt on his life.
Peters is hampered by the incompetent dentist, Shelly Minck, who tags along on the trip to New York. Peters meets a comely switchboard operator who tries to trap him into marriage. Dr. Minck attempts to get Einstein to endorse a new line of false teeth.
An untalented actor, two G-men named Spade and Archer, and a hotel detective with an Irish brogue he turns on and off at will complete the cast of characters.

Why bother? A slapstick comedy of a mystery. Even if you're too young to get the author's references to ration coupons, scrap metal drives, and 1940s slang, it's a fun mystery.