American doctor, Natalie March, travels to Siberia to find her estranged grandmother, only to uncover dark family secrets and a dangerous international plot. Dr. Natalie March always believed that her grandparents perished in the gulag, but when a young Russian woman appears in her office claiming to be her cousin, Natalie must face a surprising truth: her grandmother, Katarina M., is still very much alive. Natalie eagerly travels to Siberia to meet her, only to be drawn into a web of mystery, espionage, and danger that will push her to the limits of her endurance. Finding Katarina M . takes the reader on an extraordinary journey across Siberia—to reindeer herding camps, Sakha villages, and parties with endless vodka toasts—while it explores what it means to be loyal to your family, your country, and yourself.