The most effective scenes in this film come when it focuses on a single character, such as James Duval's Jimmy, who is hallucinating from heroin withdrawals. Steve Guttenberg, who is only in about twenty minutes of the film, also delivers some convincing lines, moving away from his typecasting as the goofy guy. He's solid here, especially in the last ten minutes. The film stays away from blood and gore, opting instead for the psychological punch. What's most interesting is the things we don't see, like the outside world, which doesn't exist here. The film is entirely focused on a single store, shunning the outside world. It's like the director wants us to be confined, along with the cast, in a single room, so that we may also experience their terror and confusion.