Belén Rueda (also from The Orphanage) plays the eponymous Julia, whose eyesight is preogressively getting worse. She is mourning the suicide of her twin sister (Sara), who was suffering from the same degenerative disease. Yet, Julia feels (rightly so) that there is something iffy about the whole suicide scenario, starting with the question of why she would kill herself now. Her amateur investigations reveal an important detail that she was not aware of about her sister: a new boyfriend. Who is he? And why doesn't anybody know anything about him, other than that he somehow exists?
