Charlie Thorne and the Royal Society

In the fourth installment of the New York Times bestselling Charlie Thorne series—which #1 New York Times bestselling author Chris Grabenstein called “a real page-burner”—Charlie searches for Isaac Newton’s secret treasure across Europe and Australia.

Charlie Thorne is a genius. Charlie Thorne is fearless. Charlie Thorne may have finally met her match.

Charlie Thorne is used to being on the run. Ever since she was recruited by the CIA to track down Einstein’s most dangerous equation, Charli...