Deception - The Locket, #1

The World is balanced on a precipice: The slippery slope leading right into hell. And all it would take for the world to topple down, is for Hitler to sneeze. Lovers, Elsbet a propagandist working for Germany, and Ian, an intelligence analyst and a finder of spies for the MI5, are torn apart by a war Ian saw coming but Elsbet refused to acknowledge. Covertly, Ian travels to Germany to compel Elsbet's return, and in November, 1939, after England has declared war on Germany, their daughter Margaret is born.
Elsbet begins a cat and mouse game with a splinter group of the S. S., and discovers their dark secret; they are devotees of Odin and Thor and practice human sacrifice. Trying to find an escape for her daughter and herself Elsbet attempts to blackmail the group. But it is too late, and she is trapped until the end. Deception is the first book in the series of the Richmond family that spans three generations and plays out on two continents.
Turn of the Key is the second book of the series.