Daphne Blake (Sarah Jeffery) moves to Ridge Valley, where her best friend Velma Dinkley (Sarah Gilman) lives. The two attend Ridge Valley High, a tech-savvy school with all the latest gadgets.
When their classmate Spencer (Adam Faison) begins acting strangely, the two decide to investigate. They discover that the top students are turning into lifeless zombies that have access to secret passages. While trying to figure out what's going on, Daphne and Velma get in trouble and land kitchen duty at the school, but that doesn't stop the super sleuths from looking into what's going on, including figuring out if their classmate Griffin (Evan Castelloe) is behind it all.