From the publisher's website:
Heroes, Villains, and Monsters contains a plethora of new threats and dangers for your swashbuckling campaign. Some wear human faces, such as the sinister Prince Villanova and the dreaded Captain Reis. Others are monsters with no earthly origin: the man-eating sirens, the horrible Schattenmann, and the inhuman Sidhe. Now, uncover their darkest secrets... and learn about the brave men and women who stand against them.