Devastated by tragedy and obsessed with restoring the love he lost, Jack—the lead resequencer on Luna, humanity’s moon colony—agrees to an extraordinary experiment with his enigmatic mentor, Reinhardt. Using a new resonance technique, a song of light and memory meant to summon the soul, Jack brings his wife, Sophie, back from oblivion. But Sophie's return is unstable; she drifts between moments of clarity and confusion, haunted by dreams and the sense that she no longer belongs in Jack’s world.

As Jack’s attempts to repair what’s been broken only deepen Sophie’s suffering, he’s forced to confront the true cost of his longing. With the help of his sentient AI, Kaj-C, Jack flees Luna for a distant oceanic planet, where a mysterious flower Sophie once discovered blooms. Their journey becomes an odyssey through memory and identity, testing the limits of science, love, and the courage to let go.

Upon returning to Luna, Jack faces one final revelation—challenging everything he believes about memory, reality, and the freedom to choose his own path. The Last Degree of Happiness is a lyrical meditation on grief, love, and the boundaries between worlds.