Jena Malone as Grace

Danny Huston as Father Romero

Thoren Ferguson as DCI Harris

Will Keen as John

Ian Pirie as Vincent

Janet Suzman as Mother Superior

Alexandra Lewis as Sister Beth

Steffan Cennydd as Michael

Kit Rakusen as Young Michael

Eilidh Fisher as Sister Meg

Jolade Obasola as Sister Matilda

Victoria Donovan as Grace's Mother

Shaun Scott as Father Carol

Godwin To as Patient's Husband

Daisy Allen as Young Grace

Marilyn O'Brien as Nurse

Valerie Sarruf as Female Patient

Brian Wells as Taxi Driver

Michael Brophy as Father Jacobs

Charlotte Palmer as Sister Dianne

David Boyle as Adoption Clerk

Helen Ayre as Nun

Kibibe Bailey as Nun

Janlyn Bales as Nun

Rachael Joanne Brown as Nun

Ruth Connick as Nun

Louise Cowen as Nun

Jennifer Dexter as Nun

Liz Harca as Nun

Amanda Heiber as Nun

Emma Hixson as Nun

Jane Holmes as Nun

Funmi Lawal as Nun

Chrysale Mariette as Nun

Julie McDonnell as Nun

Amanda McDonough as Nun

Dawn McKay as Nun

Anna Moreno as Nun

Cindy Mowatt as Nun

Carol Mzala as Nun

Lorena Panunizio as Nun

Veronica Perron as Nun

Frances Piper as Nun

Monica Purcell as Nun

Diane Rees as Nun

Sharon Rosales as Nun

Nicole Sinclair as Nun

Elena Solosh as Nun

Judith Tunbridge as Nun

Suzanne Voce as Nun

Angela White as Nun

Hasina Zberi as Nun