Deception and Desire — Janet Tanner

Ros Newman has disappeared, but the police are not concerned. They believe her high-pressure job at Vandina, a world-renowned fashion firm, and the obsessive jealousy of her hard-drinking husband have driven her to take an unannounced vacation.
But Mike Thompson, the new man in her life, does not buy this explanation. Nor does Ros's sister Maggie, who fears the worst and puts her own marital problems on hold to join Mike in his search for Ros.
Their suspenseful, romantic, and haunting odyssey takes them - and the reader - on a grand tour of exotic and mysterious locales, from the idyllic Greek island of Corfu to the grim discomfort of a North Sea oil rig, from picturesque New England towns to the wilds of South America in their quest to unravel the secrets of Ros's present and past. Their trail leads them, ultimately, to truths more shocking and dangerous than they could have imagined.