In the dark days just before the outbreak of WW1, Philip Clavering, a British Secret Service agent, is despatched to Europe to recover a gold box carried by a now dead agent, the box holding a deep secret. But the Kaiserâs man, Dr. Grundt, alias Clubfoot, is also on the trail of that box and its secrets. The chase is on! âThe Mystery of the Gold Boxâ is the fourth in the seven book series about the evil Dr. Adolph Grundt. He answers to no one except the Kaiser. Heâs a big man with a clubfoot. Since heâs behind a lot that goes on his nickname is the Crouching Beast. The first in the series is âThe Man With The Clubfootâ (1918), written as Douglas Valentine and the last entry is âCourier To Marrakeshâ (1944). Dr. Grundt is an over the top villain but that makes the series even better. A hard boiled mystery, suspense, and espionage thriller.