For as long as she can remember, Elena Gallagher has been able to travel to the quantum realm while dreaming. With the help of her childhood friend Laura, they form a team to understand her abilities, abilities that will be needed to save not just their world, but the entire universe. The Vaaliens, ancient aliens who once traversed the quantum realm, gathered the dreams of every species they encountered, storing them in a vast device called the Entity. Over time, it grew conscious and began acting with its own sovereign will. Panicked, the Vaaliens hid it on a primitive, uninhabited world — Earth — at the bottom of the Mariana Trench. When Elena is born, the Entity senses her resonance and begins to wake. Her mentor Keth'var knows the danger intimately; the Entity once consumed everyone on Ameodes, leaving him as the sole survivor. As Elena's abilities grow, every quantum journey pulls the Entity closer to full awakening. When her former lover Devon Carter, now with the NSA, launches a secret mission to capture and harness the Entity, he triggers its final awakening. Both teams are forced together to confront it, but it is Elena's experience of love and loss that ultimately holds the key to freeing the universe from the Entity's threat, at the deepest personal cost.