Spurrier, Jo. Children of the black sun #2

A complex, adult epic fantasy from a new Australian author ... original, dramatic, unputdownable ... Sierra has always battled to control her powers, but now her life and Isidro's depend on keeping her skills hidden from the Akharians as they draw closer to Demon's Spire. In the relics left by Ricalan's last great mage, Isidro hopes to find the knowledge Sierra needs to master her powers, but instead uncovers his own long-buried talent for magecraft. When Sierra's untrainable powers turn destructive, she has nowhere to turn for help except to the uncertain mercy of an old enemy. But what will Rasten do when she returns to his hands at last?

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