Exigency by Marnie Cate

Mara Stone's world was shaken, but she's a fighter. As she rebuilds her life, the web of her family's secrets continues to unravel. Facing new adversaries while having to confront her fear of losing everything she holds dear, Mara learns what it truly means to Protect the Magic.

Trapped in the cold world of Snowstrum, Mara and Cole are faced with a choice. Will they choose to be true to their promises, or fall prey to their greed and follow their own desires instead? Will magic be enough to free them from the icy fortress imprisoning them?

The second book in the Protectors of the Elemental Magic series, Exigency, is a compelling tale of fantasy, magic and coming of age.