After a vintage Chucky doll turns up at a suburban yard sale, an idyllic American town is thrown into chaos as a series of horrifying murders begin to expose the town’s hypocrisies and secrets. Meanwhile, the arrival of enemies — and allies — from Chucky’s past threatens to expose the truth behind the killings, as well as the demon doll’s untold origins.

Following her daughter's suicide, a grief-stricken mother is visited by an unconventional therapist who offers a hallucinogenic drug that will allow communion with the dead. Desperate to understand her daughter's psyche, she accepts the offer and soon finds herself terrorized by her daughter's identical experiences.