Books in Isaac Bell Series series

On the ocean liner Mauretania, two European scientists are rescued from abduction by the Van Dorn Detective Agency's chief investigator, Isaac Bell. They are holding something very precious...something that will revolutionize business and pop culture...and perhaps something more. For war clouds are looming, and a ruthless espionage agent has spotted a priceless opportunity to give the Germans an edge. But it might already be too late for Isaac Bell to stop him, and the future of the world may just hang in the balance.