In this third 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 tracks down Cleopatra’s greatest treasure in Egypt. Charlie Thorne is a genius. Charlie Thorne is a renegade. Charlie Thorne isn’t going down without a fight. After tracking down incredible discoveries by Einstein and Darwin, Charlie is back. This time, the great ruler Cleopatra has left behind an extremely valuable and powerful treasure, its location encoded on an ancient stone tablet. In 30 BCE, Cleopatra and her husband, Marc Antony, lost their war against Octavian for control of the Egyptian Empire. However, Cleopatra knew Octavian was really after the mysterious item that was the source of all her wealth and influence, so she hid it before dying by suicide. She left a series of devious clues behind for her children to find it, but they were lost to history…until now. In a breathless adventure that takes her across the globe, Charlie must fight for her life against ruthless enemies, match wits with Cleopatra, and solve the two-thousand-year-old mystery to prevent the most powerful treasure of the ancient world from falling into the wrong hands.

In this third book in the Charlie Thorne series from bestselling author Stuart Gibbs, Charlie tracks down Cleopatra’s greatest treasure in Egypt. Charlie Thorne is a genius. Charlie Thorne is a renegade. Charlie Thorne isn’t going down without a fight. After tracking down incredible discoveries by Einstein and Darwin, Charlie is back. This time, the great ruler Cleopatra has left behind an extremely valuable and powerful treasure, its location encoded on an ancient stone tablet. In 30 BCE, Cleopatra and her husband, Marc Antony, lost their war against Octavian for control of the Egyptian Empire. However, Cleopatra knew Octavian was really after the mysterious item that was the source of all her wealth and influence, so she hid it before dying by suicide. She left a series of devious clues behind for her children to find it, but they were lost to history…until now. In a breathless adventure that takes her across the globe, Charlie must fight for her life against ruthless enemies, match wits with Cleopatra, and solve the two-thousand-year-old mystery to prevent the most powerful treasure of the ancient world from falling into the wrong hands.

The Charlie Thorne series—which #1 New York Times bestselling author Chris Grabenstein called “a real page-burner”—is now available in a hardcover boxed set! Charlie Thorne is a genius. Charlie Thorne is a thief. Charlie Thorne isn’t old enough to drive. And now it’s up to her to save the world. Charlie Thorne is not your average twelve-year-old. Brilliant, adventurous, and defiant, she has been forced to help track down and protect the greatest hidden secrets of mankind: an incredibly dangerous equation devised by Einstein, an astonishing discovery by Darwin, and the mysterious source of Cleopatra’s power. To find each one, Charlie must travel the world, facing danger at every turn, cracking codes, solving mysteries, and struggling to stay ahead of the formidable lineup of enemies and government agents who are hot on her tail. This code-cracking hardcover boxed set includes: Charlie Thorne and the Last Equation Charlie Thorne and the Lost City Charlie Thorne and the Curse of Cleopatra

The Charlie Thorne series—which #1 New York Times bestselling author Chris Grabenstein called “a real page-burner”—is now available in a paperback boxed set! Charlie Thorne is a genius. Charlie Thorne is a thief. Charlie Thorne isn’t old enough to drive. And now it’s up to her to save the world. Charlie Thorne is not your average twelve-year-old. Brilliant, adventurous, and defiant, she has been forced to help track down and protect the greatest hidden secrets of mankind: an incredibly dangerous equation devised by Einstein, an astonishing discovery by Darwin, and the mysterious source of Cleopatra’s power. To find each one, Charlie must travel the world, facing danger at every turn, cracking codes, solving mysteries, and struggling to stay ahead of the formidable lineup of enemies and government agents who are hot on her tail. This code-cracking paperback boxed set includes: Charlie Thorne and the Last Equation Charlie Thorne and the Lost City Charlie Thorne and the Curse of Cleopatra

The Charlie Thorne series—which #1 New York Times bestselling author Chris Grabenstein called “a real page-burner”—is now available in a hardcover boxed set! Charlie Thorne is a genius. Charlie Thorne is a thief. Charlie Thorne isn’t old enough to drive. And now it’s up to her to save the world. Charlie Thorne is not your average twelve-year-old. Brilliant, adventurous, and defiant, she has been forced to help track down and protect the greatest hidden secrets of mankind: an incredibly dangerous equation devised by Einstein, an astonishing discovery by Darwin, the mysterious source of Cleopatra’s power, and Newton’s secret treasure. To find each one, Charlie must travel the world, facing danger at every turn, cracking codes, solving mysteries, and struggling to stay ahead of the formidable lineup of enemies and government agents who are hot on her tail. This code-cracking hardcover boxed set includes: Charlie Thorne and the Last Equation Charlie Thorne and the Lost City Charlie Thorne and the Curse of Cleopatra Charlie Thorne and the Royal Society

The Charlie Thorne series—which #1 New York Times bestselling author Chris Grabenstein called “a real page-burner”—is now available with all four books in a paperback boxed set! Charlie Thorne is a genius. Charlie Thorne is a thief. Charlie Thorne isn’t old enough to drive. And now it’s up to her to save the world. Charlie Thorne is not your average twelve-year-old. Brilliant, adventurous, and defiant, she has been forced to help track down and protect the greatest hidden secrets of mankind: an incredibly dangerous equation devised by Einstein, an astonishing discovery by Darwin, the mysterious source of Cleopatra’s power, and Newton’s secret treasure. To find each one, Charlie must travel the world, facing danger at every turn, cracking codes, solving mysteries, and struggling to stay ahead of the formidable lineup of enemies and government agents who are hot on her tail. This code-cracking paperback boxed set includes: Charlie Thorne and the Last Equation Charlie Thorne and the Lost City Charlie Thorne and the Curse of Cleopatra 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, 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.