Guardian's Vow (After Atlantis, #2)

Tane and the rest of the island crew have gotten Mercury Island back and are parked a mile in the air above the islands of Atlantis. They are frantically preparing to meet the attack of the warship Fellstorm, which is coming to capture Mercury Island.

When they are joined by Gladiolus Lark, a half-blind girl with a magical malady, the team dynamics begin to shift. Friends draw closer, and even rivals are persuaded to work together. New powers are unlocked as the team delve into the mysterie...