Strange Karma

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 Two centuries. One cursed gem. A Himalayan peak that keeps deadly secrets.
When climber Cynthia Graham pries open a hidden compartment in her late grandmother's desk, she unleashes a peril that has waited a century to strike. Inside lies a blood-red diamond—the world's rarest—and a cache of letters from 1924 penned by her great-grandfather, Andrew Irvine, detailing a doomed Everest expedition, a homicidal Sherpa, a murdered monk, and whispers of a twin to the crimson stone. Drawn by grief and an inheritance she only half understands, Cynthia follows the paper trail from fog-laced England to the spine of the Himalayas.
In Nepal, with ex-Gurkha guide Dorje at her side, she joins an expedition. Unexplained accidents and deaths dog the group. With every step upward she realizes someone is hunting her.  At 22,000 feet, in the death zone, Cynthia and a wounded Dorje race a killer across knife-edge arêtes and through a glittery ice cave filled with frozen stalactites and stalagmites. The past and present collide in the heart of the mountain and Cynthia realizes that some secrets should be forever buried. 
If you devour the atmospheric intrigue of Dan Brown, the high-altitude tension of C.J. Box, and the time-twisting mysteries of Kate Morton, you'll love Strange Karma.