What mother didn't tell Dorothy McGuire was that it's hard to be a doctor's wife. Marrying physician William Lundigan, Dorothy finds herself home alone most of the time, and also fumes silently as she watches her husband's parade of beautiful female patients. Further problems arise due to Dorothy's snooty mother-in-law (Jessie Royce Landis), who feels the girl isn't good enough for her precious son. When a pretty nurse (Joyce MacKenzie) sets her sights on the doc, Dorothy nearly packs and leaves, but relents when she realizes that her husband is faithful after all. Mother Didn't Tell Me was based on The Doctor Wears Three Faces a novel by Mary Baird.