Calum - Highland Passages, #5

Broke and willing to take any mission, private investigator Hannah Smith has been called to the home of mafia boss Nicholas Marchetti. She's tasked with finding his missing grandson. Calum MacNeill's sole purpose is to protect his son Braden from his ex's mafia family. The last thing he wants is his son being raised by mobsters. Living that life. No way. What's a dad to do? He flees the country and goes back to his roots.
Scotland. Except it's not today's Scotland. Nae, it's the Scotland of his ancestors. Hannah's hot on Cal's trail. Until he vanishes. Then she finds herself following into the adventure of a lifetime.