Ever wonder what it's like to stalk someone famous? You'll really get a feeling of it with this sloppily made, ethically questionable but occasionally fascinating documentary on the famous rock recluse Sly Stone. Dutch filmmaker Willem Alkema literally staked out the Rock and Roll Hall of Famer's house in the Hollywood Hills to get him to talk on film, something nobody else has done for two decades. For much of the film, though, all we see are interviews with some former Family Stone bandmates and associates -- weirdly, only the white ones. Eventually, out of what can pretty fairly be called desperation, Stone relented and talked on camera, in what becomes the movie's near-tragic climax. We see the legend dressed in a Spider-Man costume and living in a cheap motel, where he's trying to record his comeback album but seems more focused on suing his manager (which he went on to do last year). At best, Alkema's footage could be used as source material for another movie -- hopefully one with a happy ending, or at least one that doesn't resemble an episode of "TMZ." (Not rated.)