Teenage outcast Velma Dinkley is accused of murdering a popular classmate and has 24 hours to find the real killer, but she's sworn off mysteries forever.

Daphne's moms search for a drug dealer; Velma's dad defends Fred in court; Velma and Norville try to scrape up $500 to pay Daphne for the police files on Velma's missing mother.

Velma and Daphne must work out their complicated relationship in a self-defense class arranged by Principal Rogers for the female students. In the meantime, Norville seeks answers from Fred.

As the hottest girls in Crystal Cove High come under attack, Velma questions her feminist values and Fred analyzes his own views on women. Norville gets embroiled in a new mystery after seeking help from Daphne.

Velma is forced to spend the night with band geeks and Fred when Crystal Cove instates a city-wide curfew. Daphne makes her own discovery.

Velma vows to resolve her daddy issues. Norville rebels against his father's beta lifestyle. Fred fights against his family's anti-feminist ways. Daphne learns a series of shocking truths about her parents - and her past.

Velma tries to find answers to the serial killer problem as well as a date to the Crystal Cove Fog Festival. Daphne explores feelings for a stranger. Fred and Norville compete to be Fog King.

Velma and Daphne must confront their complicated relationship when they end up trapped in a cave. Fred proves he truly loves women for their brains. Gigi fights for Norville's attention.

Velma is forced to live a lie with Norville in the 72 hours she has to identify the serial killer, while Daphne and Fred concoct their own story to get back in with the Brains.

Velma races against the clock to find the true serial killer. Meanwhile, Daphne pursues a new career path, Fred finds a way to channel his rage and Norville tries to get as far away from his former best friend as possible.