From the publisher's website:
"In the world of the 1930s, costumed crimefighters clash with cunning criminals. The eldritch forces that empowered Merlin and Circe have emerged anew. With two-fisted research and fearless forays to far lands, a new generation of adventurers is making its mark. It's a time of mysticism, an era of heroism, and an Age of Gold!"
"GURPS Thaumatology: Age of Gold is a campaign background designed for use with the systems in GURPS Thaumatology. It includes the history of this alternate Earth, plus detailed rules for its most common forms of magic and alchemy. Players get guidelines for creating their cliffhanging crimefighters or mysterious super-powered masked men. GMs get three sample adversaries plus campaign and setting advice for this magical throwback to the Golden Age of pulps. With Thaumatology: Age of Gold, the next issue of pulse-pounding excitement is yours to conjure!"