Ten-year-old Kara follows mysterious tracks in the snow that lead her across time and space from modern-day Sweden to 1942 Germany where two siblings are hiding from the Nazis.

"In the Lower Saxony region of northwestern Germany sits the city of Osnabrück. This is where, in 1648, the Peace of Westphalia was signed, bringing the Thirty Years' War and one of the most calamitous periods of European history to an end. But the city was later to witness another calamity. Today, as one walks through Old Synagogue Street in a rich neighborhood of Osnabrück, one might miss noticing a pile of pale stones held together by chicken...