Something is definitely going on with Mabel's little brother, Henry, and she has every intention of figuring out what it is. From big troubles at school to unusual events happening at home, Mabel has every reason to be concerned about him. While trying to solve the mystery surrounding Henry, Mabel gets seated beside the meanest boy in her class, and no one, not even Mabel, could have imagined how things would turn out. As life seems to be in a downward spiral, Mabel is offered her very first job opportunity that may help her see a lot of things much more clearly.