What’s a book or movie that genuinely scared you?
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When people ask what book genuinely scared me, they usually expect an answer involving ghosts, serial killers, or something supernatural. My answer is Dark Matter by Blake Crouch.
What terrified me wasn’t a monster.
It was the possibility that every choice I’ve ever made created a different version of my life, and that somewhere, those other versions are still alive.
The novel follows Jason Dessen, a physics professor who is abducted and forced into an alternate reality. Instead of living an ordinary life with his wife and son, this version of Jason chose ambition over family and became a world-famous scientist. The device that makes this possible is “the Box,” a machine built on ideas from quantum mechanics and the multiverse. Inside the Box, reality exists in a state of endless possibilities until a person observes and chooses one.
The concept reminded me of Schrödinger’s Cat, the famous thought experiment where a cat inside a sealed box is considered both alive and dead until someone opens the box and observes the outcome. Dark Matter takes that terrifying idea and applies it to human lives. Every decision becomes a branching path, creating countless versions of us, each living a different reality.
The horror comes from realizing that none of those realities are necessarily wrong.
Somewhere there is a version of Jason who never lost his family. Somewhere there is a version who never found them. Somewhere there is a version who became everything he ever dreamed of and still ended up miserable.
As the story progresses, Jason isn’t simply traveling through alternate worlds. He’s confronting alternate versions of himself. Each believes he is the real Jason. Each feel entitled to the same life, the same wife, and the same son.
That idea disturbed me more than any monster could.
Near the end of the novel, multiple Jasons arrive in the same reality. The situation descends into chaos, violence, and death as versions of the same man fight for a life that only one of them can have. Some are killed. Others kill. They are all Jason, yet they become strangers willing to destroy one another to reclaim what they believe belongs to them.
The book forces an uncomfortable question: if another version of you had all your memories, your experiences, your hopes, and your fears, would they be any less real than you are?
What scared me most was the possibility that identity is an illusion. We like to believe we are unique, but Dark Matter suggested we are only one outcome among infinite possibilities. The person reading this could have been someone entirely different if a single choice had changed years ago.
Most horror stories are about surviving death.
Dark Matter is something worse.
It’s about a discovery of countless versions of you, countless versions of your life, and that the one you’re living may have existed only because of a series of random decisions. The thought that another version of myself might be happier, more successful, or more loved is unsettling.
But the thought that another version might be trying to take my place?
That’s what kept me awake.
-HB
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