Sisters Cass and Lisa are orphaned at a young age when their parents pass from a car wreck. Cass, who was in the car with her parents, miraculously survives the accident but it leaves her with a disfiguring scar across her cheek. When taken in by their Aunt Edith the beautiful Lisa is spoiled while traumatized and disfigured Cass is left to emotionally and socially fend for herself resulting in a lonely and isolated life.
Fortunately for Cass her parents old friend Monica is visiting from England and stops by to see the girls. She is upset to see that eighteen year old Cass still has the scar and that Edith has not allowed for the simple plastic surgery to remove it. After seeing how horrifically shy and withdrawn Cass is and the significant difference in the treatment the sisters receive, Monica asks Cass to return to London with her where she will get Cass the surgery she needs as well as the parental kindness and love.
The surgery is a success and for the next two years Cass engages in a happy and fulfilling life under the guidance of Monica. She makes friendships, dates, and when the extra time stacks up she begins a career in copywriting despite inheriting enough money from her parents to live comfortably.
When she learns a new department store, Gratons, is opening in her former hometown San Francisco she secures a job there as a copy writer and heads back to the states, with Monica's warning not to let her reunion with Lisa and Edith destroy her new found self confidence.
Once back home she visits with Lisa and Edith, with neither of them in a rush to see her, and finds their demeanors strange. Cass's confidence in her self, both inside and out, have turned her into a gorgeous woman and her aunt and sister now seem to see her as competition to Lisa socially, and romantically.
Lisa and Edith inform Cass that Lisa is in a serious relationship with Brad Kincad, the owners son of Gratons but make excuses to keep Cass from meeting him. She does end up meeting him and he invites her out to dinner where he insists Lisa and him are just casual acquaintances.
Edith sees them out together and storms over to Cass' apartment the next day where she tells her to stay away from Brad. However Lisa calls up that evening saying that Brad was telling the truth, they're just friends and any romantic feelings between them was simply wishful thinking on her part. She encourages Cass to date Brad if it makes her happy. Cass is touched by this and happy to think her and Lisa are becoming close for the first time in their lives.
Brad continues to take Cass on dates and is clearly smitten with her. One day his mother makes an appearance in her office and says she wanted to meet Cass after hearing Brad speak so much of her. However there seems to be underlying tones of worry in her demeanor.
Later that day Brad calls her office and claims to be "returning her call" but Cass insists she never called him. It's chalked up to a simple mistake on his secretary's end.
Days later while out to dinner with Brad the couple runs into Lisa and her date and Lisa asks Cass "did you ask Brad?" to which Cass is confused. Lisa claims she asked Cass to attend a party she is throwing and invite Brad to come with her but Cass has no memory of Lisa asking this.
The two attend Lisa's party and Lisa greets them by apologizing for missing Cass' call earlier that day, a call that Cass insists she didn't make.
The next day Cass and Brad go to the beach where Cass tells him about her scar and the effect it had on her life and Brad tells her she's amazing with or without a scar. They go back to her apartment so she can change before dinner. When she comes out of her room Brad is on the phone with his mother and relays a message to "thank Cass for the flowers". A bouquet of flowers had been delivered to her with a card baring Cass's name yet she didn't send them.
She tells Brad about all the strange incidents and how they are beginning to frighten her. Irritatingly Brad brushes it off as practical jokes but begins doing some sleuthing. He learns that Edith had visited his mother, falsely telling her that Cass had been in England for psychiatric care and that Lisa had been making fake calls and placing orders under Cass's name to convince Brad that she was seriously mentally ill.
Together the two tell off Lisa and Aunt Edith, with Cass walking out of their lives to start her new life with Brad.
