Highland Resilience by Keira Montclair

He vows to find her sister. She helps him find himself.

The only son of Logan Ramsay, the man known to all as the Beast of the Highlands, Gavin Ramsay feels a powerful need to prove himself. His sire thinks he’s incapable of leading a mission on his own, but when a young lass goes missing from the clan, Gavin vows to find her. His time has come—if he can avoid being distracted by the missing girl’s sister, Merewen, a sweet yet fierce beauty whose stunning talent with the bow rivals even that of his mother.

Merewen Baird will do anything to save her sister. She’s long admired Gavin, and when he agrees to search for Linet with her, she sets off on a journey with him and several of his cousins. Their search brings them to Inverness, a burgh by the sea, where they discover an underground the likes of which the Ramsay and Grant cousins have never seen. Lasses and lads fight for coin, and there are whispers of a coming shipment of illegal, human, merchandise.

To save Linet and the other lasses and lads, Merewen and Gavin must risk all—including the promise of a future with each other.