It's late summer 1947 in Vienna. Nazi war criminals are plotting to escape to Latin America to pursue their dreams of world conquest. They need supplies for their plan-and money. Fresh off his first success as a spy, David is eager to prove himself a second time. Will he find a problem to solve, or . . . in the old castle with his under-cover doctor father and his retired soldier-dog Thor . . . will the problem come looking for him?