When a millionaire discovers his daughter, Ellen (Dorothy McGuire), suffers from a fatal heart condition and has only one year to live, he determines to make it her best. Fearing it might dampen her spirits, he keeps her condition a secret. He then persuades down-on-his luck Dan Pierce (Van Johnson) to marry his daughter. Attracted by her family's wealth, Dan agrees. As the year progresses, Dan's play love gains sincerity. Disaster strikes, however, when secrets are unearthed.