From the back cover:
In a dark cell, Rollo Bargamnn, merchant of Thyatis, turns away in disgust from his evil, green-skinned prisoner; capturing this wretch cost a ship and sixty gallant men. Then his heart hardens once more, and he resumes the interrogation. Here, perhaps, he may find an answer to the question that haunts him.
What new evil is casting its shadow over the storm-swept eastern reaches of the Sea of Dread?
The trading routes are no longer safe. The attacks of the green-skinned "Orcs-of-the-Sea" and the mysterious "Ship-bane" now go unchecked. Once their raids were random, but the influence of some unseen master has made them into an organized menace.
Soon the questioning will be over; Rollo will know enough to track the threat to its lair. Then he will need a band of hardy adventurers brave enough to take on the task.
You, perhaps?
Drums on Fire Mountain is a module for 5 to 8 characters levels 5-8.