England is at war but land girl Esther Wynford is happy to be marrying the love of her life, fighter pilot Monty Grant. Their short honeymoon results in a baby, but on the birth of her daughter, Joy, Esther's world falls apart. Esther's dying mother confesses a dark secret. Esther is not her natural daughter, but the result of an exchange of babies after her own child was stillborn. Esther's real mother was forced to give up her baby and the reason is clear when Joy is born. Harshly rejected by Monty, she leaves with her child. But her fight is just beginning.