"I suppose you asked for the number again?"
"I did, but I could get no reply."
After a pause, during which Juve was lost in thought, the officer added timidly: "We'd better hurry if a crime has been committed."
Juve beckoned Michel to him.
"There are too many of us," he said. "You come along, Michel; the other two must go back to the station and be ready to join us in case of need."
The two officers and Fandor went hurriedly up the Rue Pigalle and came to a halt by Doctor Chaleck's door.
A loud ringing brought no reply. It was repeated, and finally a voice cried: "Who is there; what's the matter?"
"Open," ordered Juve.
"To whom do you wish to speak?"
"To Doctor Chaleck." And Juve added: "Open, it's the police."