In a quiet suburban town in the 1970s, a serial abductor known as "The Grabber" has been terrorizing families by mysteriously kidnapping their children. The community is shrouded in fear, and parents keep their kids closely guarded, but despite their efforts, more children vanish without a trace. Among those taken is Finney Shaw, a shy but intelligent 13-year-old boy. Finney finds himself in a soundproof basement, where The Grabber, a man with a sinister mask and an unpredictable temperament, holds him captive. The setting is chilling and grim, as Finney struggles to understand his captor's motives while grappling with the horrifying realization that the chances of escape are slim.

As Finney's captivity prolongs, he discovers an old disconnected black phone mounted on the basement wall. To his astonishment, the phone starts to ring, and when he hesitantly answers, he hears the voices of the abductor's previous victims. These ghostly voices seem determined to help him, offering cryptic clues and advice born of their own experiences. Meanwhile, Finney’s strong-willed sister, Gwen, experiences vivid dreams that offer glimpses into her brother's plight. She becomes determined to aid the police in the search, driven by these unsettling visions and her unwavering belief that Finney is still alive. Both siblings, caught in a race against time, must harness their wits and unearthly insights to confront darkness and defy the odds of survival.