The Silver Skull — L.J. Clarkson

Just when Isabelle thinks things are settling down at Mastermind Academy, they blow up again. The headmaster?s hot on her tail with an investigation that might see her expelled from school. She?s trying to please one friend by staying away from another. Then Lemuria kidnaps her family, and he will kill them, unless she hands over the crystal skull within five days. Getting the skull will not be easy when the one she entrusted it to will not return it. Time is a ticking so she must team up with her new friend to help track it down.

Poor Boldrick has had the day from hell. Ridiculed, disrespected, and attacked with a broom, he decides it is time to find a cure to become human again. Nothing he tries works for him, and somehow he?s inherited a spirit from a shaman he visited. In exchange for delivering the spirit?s messages, Boldrick receives a gibberish clue for his quest. But unraveling each clue leads him and his friends deeper into danger. The kind of danger he?s not sure they can get out of.

THE SILVER SKULL is third book in the Mastermind Academy Series, a middle grade fantasy adventure with sci-fi elements, a kick butt heroine and fluffy, by-the-book cat.