In The Shadow of Your Smile, worldwide bestselling author Mary Higgins Clark weaves a spellbinding thriller revolving around a long-held family secret that threatens to emerge and take the life of an unsuspecting heiress. At age eighty-two and in failing health, Olivia Morrow knows she has little time left. The last of her line, she faces a momentous choice: expose a long-held family secret, or take it with her to her grave. Olivia has in her possession letters from her deceased cousin Catherine, a nun, now being considered for beatification by the Catholic Church - the final step before sainthood. In her lifetime, Sister Catherine had founded seven hospitals for disabled children. Now the cure of a four-year-old boy dying of brain cancer is being attributed to her. After his case was pronounced medically hopeless, the boy`s desperate mother had organized a prayer crusade to Sister Catherine, leading to his miraculous recovery. The letters Olivia holds are the evidence that Catherine gave birth at age seventeen to a child, a son, and gave him up for adoption. Olivia knows the identity of the young man who fathered Catherine`s child: Alex Gannon, who went on to become a world-famous doctor, scientist, and inventor holding medical patents. Now, two generations later, thirty-one-year-old pediatrician Dr. Monica Farrell, Catherine`s granddaughter, stands as the rightful heir to what remains of the family fortune. But in telling Monica who she really is, Olivia would have to betray Catherine`s wishes and reveal the story behind Monica`s ancestry. The Gannon fortune is being squandered by Alex`s nephews Greg and Peter Gannon, and other board members of the Gannon Foundation, who camouflage their profligate lifestyles with philanthropy. Now their carefully constructed image is cracking. Greg, a prominent financier, is under criminal investigation, and Peter, a Broadway producer, is a suspect in the murder of a young woman who has been extorting money from him. The only people aware of Olivia`s impending choice are those exploiting the Gannon inheritance. To silence Olivia and prevent Monica from learning the secret, some of them will stop at nothing - even murder. Clark`s riveting new novel explores the juxtaposition of medical science and religious faith, and the search for identity by the daughter of a man adopted at birth.