Dean Calloway thought he understood what changing the past could cost.
He was wrong.
After surviving another impossible journey through time, Dean and Newby return home with more questions than answers. The mysterious cartridge that started everything is still hiding secrets, Project Pulse has vanished from the history where it should have existed, and somewhere beyond Dean's timeline, another version of his life is moving toward a future neither of them fully understands.
This time, finding the truth means going farther than either of them intended.
As Newby follows a temporal signal across timelines and Dean searches the past for the moment everything changed, the pieces finally begin to connect. The crystals. The cartridge. Project Pulse. The choices that created one future while leaving another behind.
But understanding what happened is only the beginning.
Because if the technology that made all of this possible still exists, so does the chance that someone will use it again.
Dean has spent years wondering whether the past could be changed.
Now he has to decide whether anyone should have that power at all.
Every save has a consequence.
Every choice creates a path.
And sooner or later, someone has to decide when the game is over.
Paradox Crystal is the third book in The Last Save trilogy, bringing Dean Calloway's journey through memory, family, friendship, and fractured timelines to its biggest decision yet.