Renowned action-adventure author Percy F. Westerman gained his knowledge of nautical warfare the hard way—through two stints of service in the Royal Navy. He later turned his experience on the high seas into a series of gripping thrillers that has captivated generations of readers young and old alike. The Rival Submarines is full of the kind of edge-of-your-seat excitement that propelled Westerman to the top of the bestseller list in his era.