From the magic prison Azbakan runs a dangerous criminal Sirius Black (Gary Oldman). In the world of magicians, he is known as the man who betrayed Harry Potter's parents (Daniel Radcliffe) and brought the Dark Lord to them. Upon learning of this, Harry yearns for revenge, but subsequent events prove that not all truth is. At Hogwarts, too, things are not going smoothly: one of Harry’s best friends is at stake. Of course, Draco Malfoy was involved. The heroes have to turn back the clock, change the course of events and even come to the aid of themselves. However, this is a well-known truth - help yourself, and it permeates the entire film. And the rules are given to violate them - such non-pedagogical advice Hermione receives from Dumbledore.