A masked man known only as the Watcher is holding three kidnapped young women in a hidden cave. When a fourth woman—Cassandra Bannister—vanishes during a solo kayak trip, her parents assume she drowned. Her husband, Dr. Matthew Bannister, refuses to believe it. At her memorial, he begins following the cryptic trail of clues Cassie left behind—starting with a mysterious envelope delivered through her yogi, and leading him to Dr. Elaine Wheeler, a quantum physicist. Through conversations weaving together Buddhism, Hindu cosmology, and cutting-edge quantum theory—Many Worlds, superposition, entanglement, and the nature of consciousness—Matthew learns Cassie had been investigating a dangerous connection between mind and physics. Meanwhile, as police close in on the Watcher and Detective Samantha Donovan fights her own trauma, Matthew receives Cassie’s message: a directive to seek out a Catholic priest named Father Romano. Superposition follows one man’s search for his missing wife, unraveling a mystery that spans a kidnapper’s underground lair, the multiverse, and the boundary between science and spirituality. Cassie’s disappearance is only the beginning—her fate is tied to a deeper cosmic truth.