Kwangchow Freddy Everard on the China Sea by David Adamson Harper

Intrigue and steamy romance in the perilous Far East. A young Navy officer has a mission to collect intelligence on Communist China's developing nation. He has been placed undercover as third mate on a British freighter with a Chinese crew. His adventures as he travels through the explosive world of corruption and exotic foreign ports. In Shanghai he is drawn into someone else's intrigue and is arrested. Can he save his mission from ending in disaster and disgrace?