They went to the Moon to find answers.They found something that should never wake up.A hidden signal deep beneath the surface.A structure that thinks in dreams.A presence that isn't alive-but isn't dead either.As reality unravels, the crew loses time, identity, and control.The Moon isn't a rock.It's a lock.And we just turned the key.The Signal Below is sci-fi horror at its most disturbing-perfect for fans of Annihilation, Dead Space, and cosmic terror that stays in your head long after the last page.