Bargain Wife (1979)

She was living a lie and falling in love! Three years of barely existing in New York made Tina desperately homesick for England. So she agreed to impersonate her friend Sonia to collect a small legacy in London. Sonia, marrying a wealthy American, didn't want it. Now the legacy turned out to be a small fortune that should rightfully belong to Dr. Charles Linton. Charles had always coolly said he'd marry for money to establish his special clinic -- and conscience-stricken, Tina knew what she would have to do.