"Three feet of water on the first floor," Maria says in a low voice. "What a mess."

While evacuating her grandmother during Hurricane Sandy, twelve-year-old Lily discovers that her Granny Collette has a mysterious past in France during World War II. 

Skylark and Wallcreeper alternates between Brooklyn in 2012 and the German-occupied town of Brume in 1944.

Filled with secret codes, dangerous missions, and a quest for a missing fountain pen, this story moves along at a brisk pace as Lily uncovers her granny's past.

Look for these clues in Skylark and Wallcreeper: