The first book in the thrilling time travel adventure trilogy from New York Times bestselling Charlie Thorne and Spy School author Stuart Gibbs. Before they wer

The past, present, and future are all at stake in this final book in the thrilling time travel adventure trilogy from New York Times bestselling author Stuart G

In this sequel to the New York Times bestselling Charlie Thorne and the Last Equation—which #1 New York Times bestselling author Chris Grabenstein called “a

The past, present, and future are all at stake in this final book in the thrilling time travel adventure trilogy from New York Times bestselling Charlie Thorne