Max in the House of Spies: A Tale of World War II (Operation Kinderspion)

"Max Bretzfeld doesn't want to move to London. Leaving home is hard and Max is alone for the first time in his life. But not for long. Max is surprised to discover that he s been joined by two unexpected traveling companions, one on each shoulder, a kobold and a dybbuk named Berg and Stein. Germany is becoming more and more dangerous for Jewish families, but Max is determined to find a way back home, and back to his parents. He has a plan to return to Berlin. It merely involves accomplishing the impossible: becoming a British spy"--Provide by publisher.