City of Skies (The Shadowislands Saga Book 1) by Farah Cook

Viking themed fantasy novel set in a scifi dystopian world with a strong female lead who falls in love with her sworn enemy. Fast-paced action that will have you turning the pages.

Nora Hunt has just joined the deadly quest to discover the ancient Viking legend of the hidden Shadowislands. Her post-apocalyptic dystopian world, Triangle of Peace, is the only home she’s ever known. But at sixteen years old, the skilled young warrior joins an elite band of Raiders called Jarls. Her mission? Merely to win the perilous battle for Shadowislands and avoid falling in love with the mysterious boy who just happens to be her worst enemy—and she’s not quite sure which task is more difficult…