A brilliant scientist, Bill Beck, ends up happily married to Julie, his doctor's receptionist. Five years after their wedding, the same doctor treats Julie for a heart condition that she decides to keep secret from her husband, who is doing serious work as a physicist developing guided missiles.
Not wishing him to be left alone if she dies, Julie suggests they adopt a child. An orphan called Hitty has been rejected many times, but Julie takes a shine to her. Bill, a pragmatist, does not understand the little girl's fantasy world, and he is angered when Hitty, meaning well, erases a chalkboard, wiping out hours of Bill's hard work.
Bill's superior at work, Grant Allan, urges him to give the girl more patience and time, but the Becks believe it could be best that Hitty be returned to the orphanage. Julie's heart gives out. After her death, Hitty tries to win over her heartbroken foster father, but Bill is inconsolable.
Hitty is returned to the orphanage. She goes missing one night and is caught in a storm. Bill and Grant hurry there to assist in a search, and when they find Hitty and save her, Bill realizes he never wants to be apart from her again.
