From the introduction:
It's the 1920s, the great war is over, but the new peace is threatened by mad cultists, secret societies, evil wizards and the living undead. The old world of magic is being washed away to make way for the modern age, but it's not going down without a fight. Join the ranks of the adventurers who keep the world safe for the ignorant, or else loot the secrets of the past for fun and profit.
Pulpfinder uses Pathfinder to create a world of pulp adventure alongside dragons and magic. It’s fantasy adventure meets the roaring 20s.