The Smugglers' Cipher

Larry isn’t an honor student, and he faces expulsion from a detective school because of his poor grades. He’s assigned a new case: to find a stolen volcanic stone belonging to the owner of a Berlin hotel. The hostess values the stone as a memory of her father, and the team of detectives learns that the father had a dark past, and that the stolen stone is connected to a long-ago story of the Berlin Wall and an old friendship.