Betrothed To The Enemy Viking (Vows and Vikings, Book 2) by Michelle Styles
A wounded Viking warrior
Must keep his enemies close....
Left for dead by a mysterious attacker, Viking warlord Kal Randrson comes round with a deep head wound and a hazy memory. And yet he instantly recognises his rescuer-captivating Lady Cynehild, whose life he turned upside down years before. Although she's his enemy, they agree to a fake betrothal to expose his attacker. But is the capable, intriguing Cynehild's mission to help him...or has she another intention entirely...?