Lucius, Narcissa, and Draco lived in the Malfoys' ancestral manor, passed down through generations. Such an enormous estate, yet only three people lived there—it was truly too desolate.
In the summer of 1992, the Ministry of Magic raided his home several times in search of Dark magic items. To avoid trouble, Lucius sold some of the "less than legal" things to Borgin and Burkes. While passing Flourish and Blotts, he ran into the Weasleys and Harry Potter.
Tom had once entrusted a diary to the Malfoys. Pomona did not know whether Lucius had been under the Imperius Curse at the time or controlled by a Horcrux, but he actually slipped that diary into Ginny Weasley's cauldron. That school year, everyone was thrown into chaos by the Basilisk.
Without Parseltongue to command it, the Basilisk was merely a snake that ate rats. It had nearly killed Filch, but who worked at Hogwarts without being prepared to die at any moment? Mrs Norris was the truly unfortunate one. She had merely gone to catch a rat and ended up petrified.
Without sufficient strength, one should not spend the summer at Hogwarts. Snakes were especially active in summer. Draco nearly ran into the Basilisk while the Bloody Baron was chasing him everywhere. His godfather grabbed him by the collar and handed him over to Dobby, and that once-obedient House-elf suddenly became a House-elf "in pursuit of freedom."
In short, it had gone mad. Hogwarts in summer meant "freedom," and its mind had been "infected." Throughout human history, even the most secluded wizard would have heard of rebels who raised the banner of "freedom." To ensure that it would not incite the House-elves into rebellion and cause another war like the one a thousand years ago, this House-elf needed to be strictly watched. Under