From the back cover:
A Level 3 Adventure
Fifth Edition Fantasy is here! This adventure module is fully compatible with the fifth edition of the world's first fantasy RPG, and ready to play in your home campaign!
Along the windswept sea coast are several natural stone columns, sacred to the Sea Goddess Pelagia. One of these pillars is the tower of a reclusive wizard, a devout follower of Pelagia. But the wizard has gone missing, and the locals suspect foul play. Surely a powerful wizard must have many enemies!
A band of fledgling heroes is tasked with entering one of the Pillars of Pelagia to contend with all manner of magical defenses, while uncovering cryptic clues to the wizard's disappearance planted by an unknown benefactor. The insidious evil plot they uncover could spell eventual doom for the surface world. But the Pillars are sacred to Pelagia, and the Sea Goddess herself might just play a minor role, aiding the heroes as they attempt to thwart a nefarious plot.