A priest who is also a doctor investigates the mysterious illness of a young nun who shares a dark secret with her twin sister who is a convicted child murderer.A priest who is also a doctor investigates the mysterious illness of a young nun who shares a dark secret with her twin sister who is a convicted child murderer.A priest who is also a doctor investigates the mysterious illness of a young nun who shares a dark secret with her twin sister who is a convicted child murderer.