Maghrurio is a middle-aged nobody working for Abner, the magical Mystic of Decra. When a fiery explosion fatally injures Abner, he asks Maghrurio with his dying breath to find his assassin. He also makes Maghrurio the newest Mystic.

With no magical training or skills, Maghrurio has his work cut out for him. He must venture forth to bring the assassin to justice while avoiding the clutches of a power-hungry duke. Accompanied by Abner's housekeeper and an apothecary he barely knows, Maghrurio must overcome his crippling self-doubt to prevent the destruction of the Mystic order. Along the way he uncovers a startling possibility - the assassin may be a Mystic himself.