From Shadow and Mist

Tessa was caught by the злoвнy king of the fairies of light, Oberon, for stealing precious gems. Now she has to become his bride and give birth to an heir if she wants to avoid cruel punishment. But when she runs from him, it turns out that a greater danger awaits her—the King of Mist, who offers her a deal: kill Oberon and free the captives. Tessa must choose between two kings and their kingdoms, while fighting her feelings for both.