NEW YORK TIMES BESTSELLER • A young scientist’s startling discovery plunges her into a twisted conspiracy with world-shattering implications in this electrifying novel from the award-winning author of The Pillars of the Earth.

“A provocative, well-paced, and sensational biotech thriller.”—Variety

Using a restricted FBI database, genetic researcher Jeanie Ferrami has located identical twins born to different mothers. Frightened by her bizarre discovery, she is determined to discover the truth at any cost—until she finds herself at the center of a scandal that could ruin her career.

To extricate herself, Jeannie plunges into a maze of hidden evidence. With growing horror, she uncovers a cynical, far-reaching conspiracy involving disturbing genetic experiments and some of the most powerful men in America—men who will kill to keep their secrets concealed.