In Bed with a Highland Beast by Kenna Kendrick

“Please. Ye can have me. Ye can have all o’ me.”
Alaric MacGregor is a man who lives by his honor—until it lands him in the clutches of the most infuriatingly beautiful woman he’s ever seen. Rescued by her, he finds himself in debt.
The price? Infiltrate the Highlands’ most feared mercenary gang – the Ravencloaks.
Lucia Donnelly has one goal: to avenge her brother’s death. But getting close to his killer requires a devious plan… After organizing Alaric’s “rescue”, honor demands he offer his aid. Flawless. Foolproof. Impossible to fail.
Or at least… until she ends up in his bed.
Sleeping with him might cost them their lives, but some battles aren’t meant to be fought. Some are meant to be surrendered.
She wore her lies like armor, but he stripped them away piece by piece.

This is a Historical Scottish romance novel of more than 400 pages. STANDALONE story, No cheating, no cliffhangers, and a guaranteed happily ever after.