"If Tomorrow Comes" is a novel by Sidney Sheldon that follows the story of Tracy Whitney, a young woman who is wrongfully imprisoned for a crime she did not commit. After enduring a harrowing experience in prison, she escapes and seeks revenge on those who betrayed her. As Tracy embarks on her quest for justice, she uses her intelligence and charm to navigate a world of crime and deception. The novel explores themes of resilience, betrayal, and the pursuit of redemption, showcasing Tracy's transformation from victim to a powerful force against her enemies.