Watch Sylvia for Free: How to Stream the Movie Online at 123Movies. . Sylvia West (Carroll Baker) may not be who she says she is. Her fiancé, the very well-to-do Frederick Summers (Peter Lawford), hires an investigator named Alan Maklin (George Maharis) to do some digging, and what he finds out about her life prior to becoming a writer is quite shocking. Will the newfound knowledge ruin the marriage? Gordon Douglas (Young at Heart) directs this drama, which is based on E.V. Cunningham's book.