Dark Watch, by Clive Cussler

Book is a softcover that has been read and is in good reading condition.

Cabrillo and his motley crew aboard the clandestine spy ship Oregon have made a very comfortable and very dangerous living working for high-powered Western interests. But their newest clients have come from the Far East to ask for Cabrillo's special brand of assistance: a consortium of Japanese shipping magnates whose fortunes are being threatened by brutal pirates trolling the waters of Southeast Asia.

Normally, such attacks on the high seas are limited to smaller ships and foreign-owned yachtseasy targets on the open ocean. Now, however, giant commercial freighters are disappearing. But when Cabrillo confronts the enemy, he learns that the pirates' predations hide a deadly international conspiracya scheme of death and slavery that Juan Cabrillo is going to blow out of the water