When Dr. Sam Gray is sent to Africa as a volunteer physician, he is counting down the days until he can go home again. During a trip to the local school to take care of the students, he runs into the Cloverdales, a missionary family determined to win every soul in Africa to Christ. While fun-loving, brightly dressed Esther Cloverdale befriends him from the start, her more serious twin sister, Grace, is not as easily won over by the agnostic doctor...