Heroes in Crisis #3 Cover B Ryan Sook Variant

Tragedies deepen as more secrets behind the "superhero hospital" called Sanctuary are revealed! What compelled Batman, Superman and Wonder Woman to create it in the first place? How was it built? And if the hospital truly is alive via A.I., who—or what—is the brain of "Sanctuary?" Another layer peeled back in the biggest mystery woven through the entire DC Universe.