The Bicycle Spy
Then Marcel learns two big secrets, and he realizes there are worse things about the war than a canceled race. When he later discovers that his friend's entire family is in imminent danger, Marcel knows he can help -- but it will involve taking a risky bicycle ride to pass along covert information. And when nothing ends up going according to plan, it's up to him to keep pedaling and think quickly... because his friend, her family, and his own future hang in the balance.
Bicycles were hugely important mode of transportation during World War II, and modern readers might not fully understand how much freedom children were given to ride them. Adding information about the Tour de France was brilliant. I loved this on a personal level, because I may have occasionally pretended to be in the French Resistance while riding my bike to school in the rain. This is a great novel for children to put themselves into given the age of the characters and their adventures.
There is still a huge amount of interest in World War II, and it's great when there are books that touch on facets of the war that haven't been covered quite as much. Hand this to readers of Meyer's Black Radishes who want to know more about France, or those who were fascinated by what the young people in Hoose's The Boys Who Challenged Hitler were able to accomplish.