With an enemy fleet intent on conquering the Shackles looming on the horizon, the adventurers must launch their own fleet of pirates and buccaneers to defend against the invaders, culminating in an epic naval battle at the edge of the Eye of Abendego. Will the adventurers defeat the invading navy and save the Shackles? Or will the independence of the Free Captains be eradicated forever? This volume of Pathfinder Adventure Path includes: From Hell's Heart, a Pathfinder RPG adventure for 13th-level characters, by Jason Nelson. Pirate plots and sinister situations to expand the horizon of your Skull & Shackles campaign, by Adam Daigle. More menacing sea monsters and terrors from the deep plaguing the Shackles, by Adam Daigle. A pirate showdown in the Pathfinder's Journal, by Robin D. Laws. Seven new monsters, by Adam Daigle, Amanda Hamon, Mark Moreland, Eric Morton, and William Thrasher.