The Threshold Child Series by Callie Kanno

Adesina was trained from childhood to serve her land as a warrior and a spy. When she is selected to combat a group of seditious magic users, she must summon all of her talents--some of which have been buried in the deepest part of her.

Book 2 of The Threshold Trilogy:Five years have passed since Adesina began on her path to lead her people, the L’avan, back to their true purpose. Her hopes for peace and prosperity are high until her husband, L’iam, is captured by an enemy bent on ultimate control. Adesina is willing to go to the end of the earth to save her husband, but as she travels deeper into unknown worlds she discovers that there is more at stake in this journey than she ever could have imagined.

Adesina, the young queen of the L’avan people, traveled across the world to rescue her husband from the hands of her enemies. After countless hardships, she finds herself trapped on the other side of a Threshold, in a realm far from her world. Now she must find her way home again and stop the power-hungry demon Cha-sak from fulfilling his plans of dominion and bloodshed.