As the gang arrives at Whirlen Merlin Magic Academy, they meet Madelyn who is excited to show them around. However, strange things start happening as they hear rumors about a giant griffin on campus. Velma and Madelyn are determined to investigate while the rest of the gang is skeptical.
During their investigation, the gang comes across some suspicious characters, including a stern headmaster and a snobby student council president. Velma, with the help of Madelyn's magic skills, discovers that the griffin sightings are tied to a mysterious book called The Grimmoire.
As they get closer to solving the mystery, they encounter more dangerous situations and even come face to face with the griffin. But with teamwork and quick thinking, they manage to outsmart the villains and save the academy from potential danger.
In the end, Madelyn impresses everyone with her magic skills and the gang heads back home, with the promise of more adventures to come.