Book 5 in the thrilling Chrono Compass series!Emma and her friends have faced ancient guardians, corrupted temporal beacons, and impossible choices across history. But nothing could prepare them for their most dangerous mission yet: meeting Dr. Elias Grey before he became the fractured mentor they know, when he was young, brilliant, and whole.Victorian London, 1885. The World's Fair of Innovation. A demonstration that will change history forever.The team arrives at the moment Dr. Grey presents his revolutionary Temporal Theory to the Royal Society, proving time travel is possible. But The Architects are already there, and Grey's trusted research partner harbors a terrible secret. As the team races to ensure the Chrono Compass is created, they discover a horrifying truth: to preserve the timeline, they must watch their mentor be destroyed.Emma must make the ultimate choice: Save the man who becomes their guide, or honor his sacrifice and ensure their own future exists. Every decision creates ripples through time. Every action has consequences they can't control. And the hardest lesson of all: sometimes being a Keeper means letting people choose their own suffering.Meanwhile, their present timeline is being rewritten. History is changing around them. The Architects are winning. And a mysterious warning from the future reveals that one of the four friends won't make it to the end.As the team completes their fifth mission, they receive a desperate message: their next jump takes them forward for the first time, to a devastated future where The Architects have won. A wasteland where time itself is broken. A timeline they must witness to understand what they're fighting to prevent.With only 24 hours to plant a temporal anchor in the heart of enemy territory, the clock is ticking.An adventure where friendship transcends time, courage means accepting impossible choices, and four teenagers must become the guardians reality needs."Every moment in history matters. Every choice has weight. Every sacrifice leaves a mark."The Inventor of Tomorrow is the fifth book in the Chrono Compass series, a middle-grade/YA science adventure that explores time travel, friendship, moral complexity, and the price of preserving reality itself.