Confined to an asylum for the criminally insane for the past four years, Nica Pierce is erroneously convinced that she, not Chucky, murdered her entire family. But when her psychiatrist introduces a new therapeutic “tool” to facilitate his patients’ group sessions — an all-too-familiar “Good Guy” doll with an innocently smiling face — a string of grisly deaths begins to plague the asylum, and Nica starts to wonder if maybe she isn’t crazy after all.