After teenage outcast Velma Dinkley is accused of killing a popular classmate, she has just 24 hours to find the real murderer. There’s only one problem: Velma has sworn off solving mysteries – forever.

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

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

As she stumbles upon her next case, Velma is forced to untangle her feelings for Daphne and Norville.

When a masked assailant threatens her family, Velma vows to get to the bottom of Project Scoobi and bring down the killer.