Nancy Kovack in a promotional photo as a bride for the 1965 film Sylvia directed by Gordon Douglas

Sylvia West is a young poetess engaged to Frederic Summers, an eccentric millionaire. Summers, a man who always fears he is being loved for his money, decides to make a small check on his prospective bride. The results of this check completely shock him. Not one fact matches ‘his’ Sylvia. Intrigued and bewildered, Summers hires detective Alan Maklin and has him make a thorough investigation on ‘Who Is Sylvia.’