Martian Time Shock - Time Shock, #3

When a NASA rover spies a Nazi Flag on Mars, MI9 agents Norton Blake and Katrina Williams must brave time and space to investigate. When their recon operation turns into an escape mission, they learn the dire truth behind the intersteller omen: time-travelling SS soldiers have a new plan for world domination... To warn humanity, Norton and Katrina must outwit and outrun their Nazi captors and alien conspirators.
If they fail at their mission, Hitler's son from another timeline may just win World War III... Martian Time Shock is the exciting third installment in the Norton Blake series of sci-fi time travel novels. If you like alternate timeline plots, alien encounters, and high-stakes battles, then you'll love this spy adventure on Mars and Earth.