*While it dangles in the air, one of the large tomes gives a violent twitch, as if trying to shake off Arthur's spell. Neither of the other books really respond, but the cover to the thin, battered little book flaps open--and Sirius sees a name on the inside cover that stops his breath.

T. M. Riddle. Riddle. Lord Voldemort. From Regulus' research. Here.

Sirius acts without thinking--he leans forward with his own wand, separates the book that moved, and opens a purple Ministry sack to bag it up. Under his breath and turning his body away from Narcissa so the movement of his lips can't be seen, he mutters to Arthur.*

That little one can't go to the Ministry. We need it.