Jack and Annie are transported to 1944 Europe, where they parachute behind enemy lines in Normandy, France, to help Allied forces during one of history's darkest moments.

Ranger, a time-traveling golden retriever with search-and-rescue training, heads to Normandy on the morning of the D-Day invasion where he meets Leo, a Jewish boy who is hiding with a local farmer, and Walt, a young American soldier fighting to free France from the Nazis.

In March 1871 Irene's family moves from London to Evreux in Normandy, but after a strange woman warns her that her mother is in danger, Irene calls upon her friends Arsène Lupin and Sherlock Holmes for help and soon the three young detectives are caughtup in the search for an ancient relic said to be in a secret crypt beneath the streets of Paris--a Paris which is torn apart by war and currently ruled by the Commune.