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 Charlie and former CIA agents Dante Garcia and Milana Moon have traveled
around the world to prevent history's greatest discoveries from falling into the wrong hands.
But after beating others to the secrets hidden by Einstein Darwin and Cleopatra they find
they are not the only ones searching for an immensely powerful discovery of Isaac Newton's.
From a chase over the rooftops of Cambridge University to scaling the Sydney Harbour Bridge to
skirting a volcanic eruption Charlie will need to think one step ahead of her opponents to
follow Newton's trail of devious clues and keep herself out of the hands of the many enemies
who are hot on her tail.
