The year is 1913. The suffragette movement is in full force as women around the country are fighting for the right to vote. Nancy and Clara, two sisters, have found work in a local women's prison. On a daily basis they are coming face-to-face with imprisoned suffragettes: women fighting for the same freedoms they want for themselves. Nancy finds herself drawn to one inmate in particular - the enigmatic 'Duchess' - and decides to follow her into the fight. But Clara is torn by the very laws her sister has chosen to try to change. She's fallen in love, and yet marriage would mean giving up the job she loves, and losing her independence forever. How can she possibly choose between the two sides of her heart and not lose a part of herself?