Luc, a renowned opera singer, agrees to run a singing workshop at a women’s prison over the course of a summer. Although initially wary of him, Carole, Jeannine, Noor, Jess, Marzena and Catherine eventually capture his full attention. Luc soon finds himself confronted by the unpredictable and clashing temperaments of these challenging inmates, whilst the prison is in turmoil. How will he manage to harmonise their voices? Will he be able – and at what cost – to make them feel a semblance of freedom through song?