Torn between duty and desire, he wants her in his bed, but loving her would be a fool’s game. The Highlander Who Loved Me (Highland Heart Series Book 1) by Tara Kingston

Johanna Templeton is on a life-and-death quest. Swept into an intrigue that rivals the tales she pens, she joins forces with a Highland rogue to find the treasure that will save her kidnapped niece—a prize the Scot seeks for reasons that have nothing to do with ransom. Engaging the Highlander in a sizzling battle of the sexes, Johanna shields her heart.

Connor MacMasters, spy for Queen Victoria, is a man on a mission—keep a legendary gemstone from an evil man. Trailing an American novelist who holds the key to the treasure should’ve been simple, but Johanna awakens feelings he’d long thought dead. Torn between duty and desire, he wants her in his bed, but loving her would be a fool’s game. Blasted shame his heart doesn’t agree.