Samuel Cole has spent thirty-one years being told he's wrong.
The rock formations that don't match official surveys. The childhood neighbor everyone insists never existed. The strangers who vanish mid-stride while the world keeps walking.
He's learned to bury what he sees. To trust the records over his own eyes. To accept that his perceptions are the problem.
Then a woman appears who asks the question no one else will: What did you see before you decided not to see it?
Now Samuel is being hunted by people who shouldn't know his name, recruited by an organization older than recorded history, and forced to confront a conspiracy that makes every "false memory" he's ever had look like evidence. His twin sister Hannah is caught in the crossfire — marked by forces that see her existence as a problem to be solved.
To save her, Samuel will have to trust the one thing he's spent his whole life learning to doubt: himself.
The Mandela Effect isn't a glitch. It's a warning.