Jo Ericsson, a seasoned Swedish astronaut aboard the International Space Station, faces unimaginable horror when a catastrophic collision with an unknown anomaly severely damages the vessel, killing her colleague Paul. Amidst the chaos, Jo desperately tries to save the remaining crew and repair the crippled station before returning to Earth. Upon her harrowing touchdown, however, she is unsettled to discover her homecoming feels fundamentally wrong. Reality itself appears fractured; her daughter Alice’s personality has shifted, certain everyday objects are subtly different, and high-ranking space agency officials are hiding dark secrets about the true nature of her mission.Simultaneously, on Earth, Henry Caldera—a disgraced Nobel-laureate physicist—grapples with his own crisis. Henry is obsessed with the CALIGULA experiment, a
quantum physics device currently stationed aboard the ISS that was active during Jo's accident. Driven by a desperate ambition to validate his groundbreaking theories on quantum entanglement, Henry becomes increasingly erratic, suspecting that the collision triggered a superposition event that has bridged two parallel realities. As his grip on sanity frays, Henry’s fate becomes inextricably linked to Jo’s as they both realize they are bleeding memories and experiences across alternate timelines.Back in her suburban home, Jo’s reality continues to unravel. She experiences terrifying hallucinations, memory lapses, and the haunting realization that the daughter she holds is not entirely the one she left behind. Her husband, Magnus, grows increasingly concerned by her paranoia, while shadowy government operatives closely monitor Jo, treating her not as a survivor, but as a dangerous anomaly to be contained. Jo uncovers classified logs revealing that the space agency purposefully sent her into orbit to test the CALIGULA device, weaponizing
quantum mechanics to observe macroscopic superposition.Driven by maternal instinct and a desperate need for truth, Jo goes on the run with Alice, evading capture while searching for answers. Meanwhile, Henry confronts the chilling consequences of his ambition, realizing his experiment has trapped versions of people on the wrong sides of reality. The narrative converges in a remote, snowy cabin, where the boundaries between the two universes finally dissolve completely. Jo and her alternate self must confront the tragic choices that led to their divided fates. Ultimately, Jo finds a fragile peace, reconciling with the profound realization that love transcends the infinite corridors of the multiverse, leaving her forever changed by the cosmos.