Undercurrent — Louise Rose-Innes

Crane stared at the stranger's face through a sea of tuxedos and ball dresses and was immediately transported back to a dusty mountain road somewhere north of Kabul roughly five years earlier. Not in his wildest dreams had he ever thought he'd see that face again.

When former U.S. Marine turned private investigator Munro Crane is asked by the man who saved his life to spy on his wife, Crane knows he can't refuse. He owes the guy.

Then Kaz's wife, Sarah, gives him the slip. Not an easy feat. Instinctively, Crane suspects there's something more going on than just an affair. She's taking precautions. She knows her husband is having her followed and she's scared. Why? And why is Sarah so interested in a fatal boating accident off the Oregon coast? Crane tracks Sarah as she secretly investigates and soon becomes involved in a web of fear, corruption, and murder.

Now Crane has to make a choice. Does he remain loyal to his client â€" the man who saved his life â€" or does he break his cardinal rule and switch sides to help Sarah, which would mean getting personal?

Before he can decide, something happens that thrusts him deeper into Kaz's illicit network than he cares to be. The choice is made for him. But can he still help Sarah, while working for Kaz? Or will his betrayal be discovered and put his and Sarah's life at risk?

This is the first book in the gripping Munro Crane series.