Sylvia is a 1965 dramatic film based on the novel "Sylvia" by author E.V. Cunningham. Young poet Sylvia West (Carroll Baker) is beautiful, successful and engaged to California millionaire Frederic Summers (Peter Lawford). A careful man, especially regarding his fortune, Summers hires private investigator Alan Macklin (George Maharis) to dig into Sylvia's past. With each contact Macklin makes, a piece of Sylvia's story is revealed and it doesn't seem to add up to the cultured, classy woman who Summers is planning to marry. However, as Macklin learns more about the real Sylvia, his feelings for her evolve. With a strong supporting cast and an element of mystery, this film cunningly reveals the tawdry details of who Sylvia West is, and how she became the almost perfect woman who Summers wants to marry. The question is whether Macklin will tell Summers what he knows, and how the truth will affect the relationships of all involved.