Louisa Clark arrives in New York ready to start a new life, confident that she can embrace this new adventure and keep her relationship with Ambulance Sam alive across several thousand miles. She steps into the world of the superrich, working for Leonard Gopnik and his much younger second wife, Agnes. Lou is determined to get the most out of the experience and throws herself into her new job and New York life.
As Lou tries to keep the two sides of her world together, she finds herself carrying secrets not all her own that cause a catastrophic change in her circumstances. And when matters come to a head, she has to ask herself, Who is Louisa Clark? And how do you reconcile a heart that lives in two places?