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.

When Principal Rogers enrolls all the female students in a self-defense class, Velma and Daphane must work out their complicated relationship on the mat. Meanwhile, Norville vows to get answers from Fred...by any means necessary.