The Blood of a Dragon by Jack Adkins

Anuka Sandbar is the most interesting half-goblin alive. Just ask him. While searching for his famous father, a roguish young half-goblin swashbuckler and his unlikely companions are enslaved by pirates. An emissary of the Silver DragonLord Augmaximitis buys them and offers them freedom if they can find the source of illegal DragonsBlood flooding the country. They soon discover that success could trigger a war between Dragons that would destray the mortal races. How will they choose between gaining their freedom and dooming the world?