Cybermage. Worldweavers, #3

An Elemental Mage. Thea Winthrop comes into her own, acknowledged as a very rare Elemental Mage - and is quickly drawn into a web of magical intrigue as her new powers bring her face to face with Nikola Tesla, once known as the New WIzard of the West and the only known quad-Elemental Mage  in human history. But he is in trouble, trapped by the treacherous Alphiri, and it is up to Thea and her friends to step in and save both the great mage himself and (once again) their own magical world. Elemental magic is strong, but in the face of tragedy and betrayal it is the power of friendship and willing sacrifice for the greater good that can change Thea's world.