The only reprieve from his isolation arrived in the form of owls laden with letters from Ron, Hermione, and more significantly, Draco. It became clear to Harry pretty quickly that Draco had been sequestered at Grimmauld Place with the Order - not because Draco had explicitly said so, but rather because whenever Ron or Hermione wrote to him, a letter from Draco would always accompany theirs, making it so that Draco wrote to him twice as often as the other two. His letters were also consistently more entertaining - while Ron and Hermione had clearly interpreted Dumbledore’s instruction not to tell him anything, as not to tell him  anything, Draco’s interpretation had been significantly more liberal.