Monarch of Manhattan was the second novel written by Dan Humphrey. Set in an alternate universe where Manhattan is a monarchy, Monarch of Manhattan was only just sent to Dan's publisher in season five. It is unknown what became of this novel, as it was sabotaged by Chuck Bass into appearing plagiarized in an effort to have Dan dropped by his publisher.
- Dan's publisher originally wanted a sequel to Inside. However, Dan opts for a period piece set in the Old West. When his publisher didn't like that idea, he wrote the alternate universe story Monarch of Manhattan.
- Blair Waldorf serves as the inspiration for the novel's protagonist, the monarch of Manhattan.
- According to Dan's agent, Alessandra Steele, the story is "brilliant."