While Amy is preparing for her father's Halloween-themed wedding, she, Gilbert and Marshall discover that Harold and Rose may be in danger. An evil mu妹妹y is unexpectedly awakened and out for revenge. 剧情建起传统警匪对峙的框架，正邪双方同样为养家糊口，同样是各为其主，同样带点惺惺相惜，稍后大量添加火势。