In this sinister film brimming with lurid thrills, a pre-"Basic Instinct" Sharon Stone stars as an emotionally fragile young woman who uses the titular implement to defend herself against a stranger's sexual assault in the elevator of her big city apartment building. It's all downhill from there, as Stone is driven to paranoia and madness despite─or perhaps because of─the attentions of her neighbors. Co-stars Ronny Cox, Steve Railsback (in a dual role). 105 min. Widescreen; Soundtrack: English; theatrical trailers.