Under Dark Waters by Bernadette Calonego
Driven by lingering pain and grief, historian Sonya Werner leaves her home in Switzerland to travel across the world. Officially, shes tracking down the German author Else Seel, who had left Berlin in the 1920s to marry a Canadian trapper and homestead in the wild woods of British Columbia. But the real reason for her trip is much more difficult to face: three years before, her husband took off to this part of the world on one of his usual mountain-climbing adventures, and never returned. Only after the police brought her word of his deathand the mysterious circumstances in which they found himdid Sonya discover the simultaneous disappearance of her beautiful best friend, Odette, and the possibility that her husband had been lying to her all along. Now, haunted by sorrow and jealousy, Sonya sets out on a dangerous mission to discover the truth, and to try to put back together the pieces of her broken heart.