Hidden Vault

A vintage aircraft crashes into Lake Michigan. Mike Barron and his business partner are sport fishing on a nearby boat. They rescue the pilot who pulls a gun on boat's crew. The man is subdued but escapes when they go ashore. That night Mike and his partner are shot at as they travel home from the lake. Mike learns that the plane was stolen and its owner lives in Wisconsin and travels there to check on him. There he discovered the man had been assisting investigators in Germany about a missing horde of gold taken from holocaust victims during World War II. Mike travels to Germany to meet with the investigators there. He is joined in the investigation by a young woman law student. While in Germany he is attacked multiple times by members of two different gangs who are also searching for the horde. Mike learns that the gold had moved to the US long ago. Mike returns to the US and soon joined by the young woman. They are shadowed by the German gangs, as they follow up on many leads that take them throughout the US Midwest. Do they eventually prevail? And will justice be done?