"It will want the best brains in the force to get to the bottom of this thing.

It will be a London job before it is finished." He raised the hand lamp and walked slowly round the room.

"Hullo!" he cried, excitedly, drawing the window curtain to one side.

"What o'clock were those curtains drawn ?" "When the lamps were lit," said the butler.

"It would be shortly after four." "Someone had been hiding here, sure enough." He held down the light, and the marks of muddy boots were very visible in the corner.