The plot revolves around a naive 17-year old girl, Susan Slade (Connie Stevens) who becomes pregnant during a shipboard romance with Conn White, a mountain climber (Grant Williams). Her parents decide that it is best for Susan to allow them to pass the baby off as theirs to protect her reputation. Feeling helpless, Susan reluctantly agrees to pretend to be the baby's older sister. Later, two suitors, Hoyt Brecker (Troy Donahue) and Wells Corbett (Bert Convy) court Susan, not knowing that she is a mother. Susan increasingly struggles with the lie she is living with and finds it difficult to keep up the charade especially with the new love in her life.