This episode is, as the title says, a Halloween-based episode. The Halloween based episodes of Walker seem to take a creepy turn, though this one is different than "Evil in the Night". The plot deals with Walker and company going after a satanic cult who abducts children for sacrifice and leaves a pentagram at the source of kidnapping. Walker and Trivette, along with Carlos and Trent, all band together to solve this case.
This episode is rather creepy and believe me, the Halloween episodes of Walker take a creepy turn, even if there were only 2 episodes, this and "Evil in the Night". I noticed that Hallmark never airs it, and I don't blame them for not airing it. It would scare kids to some degree.