Jennifer lives a luxurious life with her wealthy and powerful husband Laurence (Joe Alwyn). When an unfortunate event wipes her memory, she struggles to find her identity until she stumbles upon wistful love letters hidden in her home. The passionate notes unravel a star-crossed love affair she had with foreign correspondent Anthony O’Hare (Callum Turner) and ultimately lead her to discover her true self.

Jennifer’s story becomes intertwined with that of Ellie, a whip-smart journalist in contemporary London, who discovers and becomes enthralled by these love letters from a bygone era. As she begins to piece them together with the help of archivist Rory (Nabhaan Rizwan), she sets off on a journey that will entangle the two women’s lives forever.