Ron was staring over Harry’s shoulder. Harry wheeled around. With a snap, the man in the shadows closed the door behind them.

A mass of filthy, matted hair hung to his elbows. If eyes hadn’t been shining out of the deep, dark sockets, he might have been a corpse. The waxy skin was stretched so tightly over the bones of his face, it looked like a skull. His yellow teeth were bared in a grin. It was Sirius Black.

“Expelliarmus!” he croaked, pointing Ron’s wand at them.

Harry’s and Hermione’s wands shot out of their hands, high in the air, and Black caught them. Then he took a step closer. His eyes were fixed on Harry.

“I thought you’d come and help your friend,” he said hoarsely.