Clive Cussler's The Sea Wolves

Can Isaac Bell stop a world war being lost before it begins? A rip-roaring new novel from the Grand Master of Adventure's historical thriller series
August, 1914, the eve of WWI. When Chief Investigator Isaac Bell discovers a hidden radio transmitter in a shipment of rifles bound for Britain, he realises it will broadcast the exact location of the merchant ship to waiting German U-boats.
This ship is saved -- but two others have already departed.
In a desperate race against time, Bell sets out to foil the sabotage, and hunt down the saboteur. Little does he realise that a sophisticated German spy ring is operating out of New York City's docks - and their secret could determine the outcome of the war...