For many years, the wizarding community has been living in peace, after the epic battle at Hogwarts, when the most evil and powerful magician in the history of Voldemort was defeated. There are, of course, incidents when the established rules are violated, but for this there is an Auror service, where the grown-up Harry Potter successfully works. And in his spare time, he raises children, does not have a soul in his beautiful Ginny and gladly hosts Ron, Hermione and their entire family.
Death Eaters have become characters in children's horror stories, but not everyone thinks so. Volan De Mort was not so simple and very vindictive. Not believing in his death, he nevertheless took some measures so that in her case there would be successors to his terrible deeds. And such followers, greedy, power-hungry, eager to command, will always be found. Such is the nature of some people and wizards.
Some strange occurrences indicate that the dark forces are gathering again. By a drop of a secret potion, by a small almost innocent spell, they gather in a secret place, protected by such seals that Dumbledore, if he were alive, would become thoughtful. When they reach full power, no one will be able to cope with this horror.