Books in the Albert and Tillie Mystery series

It is 1938 -- a year when most Americans are still coping with the Great Depression and wondering how long they can avoid the inevitable war and Nazi threat in Europe.When thirteen-year-old Orville Switzer discovers the bodies of twin sisters lying frozen beneath the snow in a St. Paul, Minnesota train yard, connections are soon linked to Germany. In their efforts to discover who murdered the twins and why, sheriff's deputy Al Freitag and his wife Tillie, a social worker for Orville's family, are suddenly plunged into a web of mystery, intrigue, mob violence, and an espionage ring involving pro-Nazi and German American Bund members.Will the truth behind the murders be discovered? At what cost?