Julie Trent and the Tempest (Hardcover, Turtleback School & Library ed.)

The second book in the series follows on from where the first book left off. Desperate to put right all that has gone wrong since the evil Lupas came to Earth, Julie and her friends go in search of a powerful entity, the Tempest, which is feared by the Lupas and worshiped by the Troganors. The creature is being held prisoner by the Lupas and Julie and the others believe if they can free the Tempest they will be able to defeat the Lupas once and for all. Their quest comes with one deadly warning--if they fail they will have condemned the planet Earth to destruction and humanity to extinction. The second book is filled with even more twists, turns, danger, excitement, magic and humor than the first.