“What space opera is meant to be. A brilliantly complex novel about love, loss, and war.” —K.B. Wagers A starship captain and her crew face conspiracies and betrayals as they clash with various factions of a galactic civil war in a thrilling space adventure by New York Times bestselling author Mike Chen. The starship Horizon’s crew spent ten years trapped across the expanse of space. Now they’re finally home—only it’s not the home they knew. The Cluster, once a peaceful coalition of planets, has fractured in the wake of civil war. Captain Demora Kim wants nothing more than to protect her surviving crew. It’s what she owes them after years of instability and terror. But in times of war, no one is allowed neutrality. After an attack on a mining station leaves thousands dead, Demi’s efforts become almost impossible. Every ship is needed on the frontline. Thrust deeper into a conflict she barely understands, Demi considers a bold choice—one that might keep her promises but tip the galaxy further into chaos. “Mike Chen has done it again. The Photonic Effect is bursting with unexpected twists and wild rides, but most of all, it's full of heart.” —Annalee Newitz “One of the strongest space operas I’ve read in recent years. A thrilling, emotionally grounded story about survival, leadership, and the true cost of command.” —Karen Osborne