The end ties up neatly, but it feels heavier than the ending of past books, simply because the work is not yet all done—Sirius Black is still considered dangerous, and Peter Pettigrew, who actually is dangerous, is loose again. But the year has ended and Harry has done and learned everything he can. He returns to the Dursleys with the ability to drop Black's name whenever he wants to get something out of his uncle or cousin, and he dutifully will await his return to Hogwarts in the fall.