When Caroline wakes up in a Paris hospital with no memory of her past, she's confused to learn that for years she's lived a sad, reclusive life in a sprawling apartment on the rue Cler. Slowly regaining vague memories of a man and a young child, she vows to piece her life back together--though she can't help but feel she may be in danger. A budding friendship with the chef of a charming nearby restaurant takes her mind off her foggy past, as does a startling mystery from decades prior. In Nazi-occupied Paris, a young widow named Céline is trying to build a new life for her daughter while working in her father's flower shop and hoping to find love again. Then a ruthless German officer discovers her Jewish ancestry and Céline is forced to play a dangerous game to secure the safety of her loved ones. When her worst fears come true, she must fight back in order to save the person she loves most: her daughter. When Caroline discovers Céline's letters tucked away in a closet, she realizes that her apartment harbors dark secrets--and that she may have more in common with Céline than she could have ever imagined.