Lydia and Jackson witness a werewolf assault at the video store. Stiles is concerned for his dad, the sheriff. Allison's auntie gives her a family treasure and urges her to utilize it to get familiar with the family ancestry. Scott and Allison take an impromptu day off on her birthday. Derek faces Jackson about what he saw the prior night. Derek gets an unexpected visit. At the parent instructor meetings Scott's mother and Allison's dad discover the two of them played hooky that day... After the meeting somebody pulls a gun...and utilizes it.