The Seatons, affluent members of the Protestant gentry, own The Haven, a lush, opulent estate in the Scottish countryside. The Flynns, proud Catholics to the core, spend their working days in the factories and laundry houses of industrial Glasgow. Divided by class, wealth and religion, two families could not live more different lives. However, as the Great War fades from memory and discontent seeps in, both the Seatons and the Flynns grow restless and allow temptation to gain hold...