Jason Dessen is a perfectly ordinary physics professor living a perfectly ordinary life in Chicago, which in thriller terms means he is about three pages away from everything going catastrophically wrong. He loves his wife Daniela, adores his son Charlie, and has the quiet, nagging suspicion that maybe—*just maybe*—he could have been a scientific rock star if he hadn’t chosen love over ambition. This thought, as it turns out, is the universe’s cue to pull a prank of cosmic proportions.
One night, Jason is kidnapped by a man wearing a creepy mask who asks the most ominous question imaginable: “Are you happy with your life?” (First rule of thrillers: never answer this honestly.) Jason wakes up to discover that reality has hit shuffle. He’s no longer a mild-mannered professor; instead, he’s a world-famous physicist who invented a miraculous device known as “the Box”, which can access alternate universes. Unfortunately, this impressive résumé comes with a downside: no wife, no kid, and colleagues who look at him like he’s forgotten his own name—which, to be fair, he kind of has.
Meanwhile, the other Jason—the one who invented the Box—has hijacked Original Jason’s family-filled universe because he regrets choosing science over love. Apparently, multiverse theory does not include ethical guidelines or custody agreements.
Original Jason, understandably upset about being booted out of his own life, embarks on an interdimensional road trip to get it back. With the help of Amanda, a psychologist who somehow didn’t see this nightmare coming, Jason hops between alternate realities. These worlds range from “slightly inconvenient” to “Mad Max but with better city planning,” all governed by the idea that every choice creates a new universe. This means there exists a Jason for every bad haircut, every questionable career move, and of course every regrettable text message ever sent.
As Jason tumbles through realities—many of them lethal—he learns an important lesson: the multiverse is infinite, but most versions of Chicago end badly for you. Also, running while confused is a surprisingly transferable skill across universes.
Eventually, Jason figures out that the way to find his exact universe is by focusing intensely on his love for Daniela and Charlie, proving once and for all that romance novels and quantum physics are spiritually aligned. He finally makes it home—only to discover there are many other Jasons who’ve had the exact same idea. Now it’s a fight between dozens of equally determined men, all shouting, “No, I’m the real husband!”
In the end, our Jason secures his family, the impostor is dealt with, and the Box is destroyed, because nothing good ever comes from devices that weaponize regret. Jason embraces his life exactly as it is, having learned that wondering “what if?” is fine, but actually visiting those timelines is exhausting, traumatic, and extremely bad for your survival odds.
