“Well, we’ll have a look, anyhow. Come along.”

The coster had joined them now, and they all entered together.

“Did the old girl go up to Forrest’s flat all right?” asked the third detective of the porter.

“That’s right. Went straight to the door and started something about a subscription. Then Mrs. Forrest pulled her in quick and slammed the door. Nobody’s come down since.”

“Right. We’ll take ourselves up—and mind you don’t let anybody give us the slip by the staircase. Now then, Wimsey, she knows you as Templeton, but she may still not know for certain that you’re working with us. Ring the bell, and when the door’s opened, stick your foot inside. We’ll stand just round the corner here and be ready to rush.”

This manœuvre was executed. They heard the bell trill loudly.

Nobody came to answer it, however. Wimsey rang again, and then bent his ear to the door.

“Charles,” he cried suddenly, “there’s something going on here.” His face was white. “Be quick! I couldn’t stand another—!”

Parker hastened up and listened. Then he caught Peter’s stick and hammered on the door, so that the hollow liftshaft echoed with the clamour.

“Come on there—open the door—this is the police.”