For the first time in Russian - the famous bestseller of the British journalist Marcella Bernstein, which formed the basis of the film released in 2003, which starred Gérard Depardieu and Carmen Maura (Pedro Almodovar's favorite actress). The nun of the Jesuit order has Sister Gideon (in the world - Sarah) suddenly symptoms of an unknown disease appear. The priest Michael Falcone is entrusted with understanding the reasons for this, and he finds out that in the young woman’s past there is a terrible secret hidden, connected with her twin sister Kate, who is serving a life sentence in solitary confinement. Moreover, Michael is sure that the symptoms observed in Sister Gideon are only a reflection of a dangerous disease that Kate suffers from (probably without knowing it). Having found Kate, he is imbued with a criminal passion for her, in addition, he is tormented by painful doubts - is she really guilty of the bloody murder for which she was convicted...