Predator's Gold, the second book in the Mortal Engines Quartet series, is a young-adult science fiction novel written by Philip Reeve and published in 2003.

In that time, lovers Tom Natsworthy and Hester Shaw have been using the Jenny Haniver, their deceased comrade Anna Fang's airship, to travel across the world trading and adventuring.

They are soon pursued by airships of the Green Storm, a fanatical splinter group of the Anti-Traction League, who want the Jenny Haniver as they believe it was stolen from their deceased leader and friend to Tom and Hester, Anna Fang.

They are rescued by Anchorage, which was once a thriving Traction City that relied primarily upon trade, but had recently been devastated by an excavated biological weapon that killed most of the inhabitants.

As Anchorage's harbormaster works to repair the Jenny Haniver, Hester becomes jealous of Tom's growing closeness to Freya, and is also disturbed by the sightings of "ghosts" in the city.

Hester is taken to Rogue's Roost, an island south of Greenland, where the Green Storm have converted Anna Fang's body into a Stalker.

Caul tells him that the city is ruled by "Uncle", a man who founded it as a base of thieves and keeps the Lost Boys under constant surveillance.

Freya catches Pennyroyal secretly broadcasting a radio message asking for someone to come and get him off of Anchorage, and he subsequently admits to her that his claims of traveling to America were all lies.

With the revelation that Pennyroyal is a fraud, the inhabitants lose hope in the salvation of their city, until Caul arrives with the Reykjavik map, and convinces them to continue.

Meanwhile, Pennyroyal escapes to the Hunting Ground, and soon publishes a book reimagining the events of Anchorage's flight west, with himself as the hero and exposing the Lost Boys.