Easter Eggs in the Mud

Hanging out at the local snack bar, Joe discovers that the owner, Harry, hasn't seen his sister, Genia, since they were separated during World War II.  Joe and his twin sister, Izzy, want to solve the mystery of what happened to Genia almost eighty years ago.  Joe and Izzy time-travel to 1942 Poland during the height of World War Ii hoping to find young Harry and Genia when they were children.  Nazi-occupied Poland is a dangerous place to solve a mystery, especially if you're dodging soldiers, smuggling food, and hiding in sewers.  Will the twins be able to find the answers they need to help Harry, and return safely to their 21st century home?