So, he had always suspected that Voldemort had some backup plan in place.
And he had always had a feeling that Voldemort might not be dead yet.
For many years, the matter of Voldemort had continued to weigh heavily on Dumbledore's mind.
He had never expected that after Black enrolled at Hogwarts, not only would he learn that Voldemort's backup plan was Horcruxes—
Just when he still had no idea how many Horcruxes Voldemort had made and was prepared to spend a great deal of time searching for them—
Black had directly helped him find several Horcruxes!
And now, how long had it even been since they destroyed Ravenclaw's Diadem and the Diary, those two Horcruxes?
Yet he had already found a third Horcrux so quickly!
At that moment, Black took out the Locket and said, "Professor, it seems our original guess was correct."
"After Ravenclaw's Diadem... Slytherin's Locket also became one of his Horcruxes."
Dumbledore accepted the Locket, which Black had tightly sealed with magic.
He lifted it and held it close to his nose, examining it carefully.
After a while, he placed the Locket back in Black's hand.
"This is a very good start... At the very least, we now have the strongest possible lead regarding the next Horcrux."
Holding the Horcrux Dumbledore had returned to him, Black looked at Dumbledore in surprise.
He had not expected Dumbledore to no longer care at all about him possessing Voldemort's Horcrux.
Back then, Dumbledore had wanted to take the Horcrux away and destroy it immediately.
Black had put quite a bit of effort into getting that Diary for research.
Dumbledore seemed to see through Black's thoughts. Smiling, he said, "Black, I believe you have the ability to handle this Horcrux. So I will not interfere too much with whatever you