Penance creates an amplifier to spread Mary's song across the city - but first, Mary must find her elusive voice. As danger mounts against her group, Amalia propositions an unlikely ally and sets out to expand the Orphanage's reach.

Cast: Laura Donnelly, Ann Skelly, Olivia Williams, James Norton, Eleanor Tomlinson, Amy Manson, Martyn Ford, Pip Torrens, Elizabeth Berrington, Tom Riley, Ben Chaplin, Nick Frost, Anna Devlin, Denis O'Hare, Rochelle Neil