A first love is never easily forgotten—and coming face to face with that person again can be awkward when the heartstrings are still holding on to the “what ifs.”

In settings from 1865 to 1910, nine couples are thrown back on the same path by life’s changes and challenges. A neighbor returns from law school. An heiress seeks a quick marriage. A soldier’s homecoming is painful. A family needs help. A prodigal son returns. A rogue aeronaut drops from the sky. A runaway bridegroom comes home. A letter for aid is sent. A doctor needs a nurse. Can love rekindle despite the separation of time and space?