A romance begins in 1943, in wartime Britain, between Annabelle, an English pianist, and Andrew, a United States Airforce Engineer. An accident separates them before she can tell him she's pregnant, as he's flown back to America. She has identical twin daughters via a caesarean section but is deceived into thinking she's had only one baby - by the Adoption Agent. Annabelle had changed her mind about adoption but Andrew had heard otherwise. The Adoption Agent gave one child to Annabelle and the other to Andrew in America. Neither parent or twins knew there was a twin sibling until the twins meet in their twenties and begin the process of unearthing the truth about their birth.
