They searched for an hour but found no trace of him at all.

Then they returned to the house to make a report and get help.

I will now show you how Craig first eluded them." He led the way along a tangled path, doubled back, plunged into a little spinney and came suddenly to a small shed.
"This is an ancient gamekeeper's shelter," he explained, "built a long time ago and almost forgotten now.

What Craig did, without a doubt, was to hide in this.

The Scotland Yard man who took the affair in hand found distinct traces here of recent occupation.