When the Signal—a mysterious transmission pulsing from the edge of the solar system— arrives, the world changes overnight. Planes are grounded, satellites fail, and speculation abounds. With many believing this could be first contact with extraterrestrial life, humanity holds its breath. But for Alex, a thirtysomething lawyer who’s spent years distancing himself from the unexplainable, the Signal feels deeply personal—the opening of an old wound.

Decades ago, Alex and a girl named Ana both vanished for thirty-six hours while on vacation near Palm Springs. When they returned, dazed but unharmed, the six-year-olds’ account of their experience had all the hallmarks of an alien abduction.