The guard unlocked the door to let them out.

As they appeared upon the platform, the two detectives who had come down with them joined company.

“Call a cab, Willet, if you please. We will go at once to the docks and try to engage a vessel of some kind to take us to Guernsey.”

“Yes, sir; but if you please, I think we had better call first at police head-quarters to make inquiries. They may have some later and better intelligence,” suggested the detective.

“Exactly! yes! to be sure! You are quite right. We will go there first,” agreed the General.

The detective beckoned the cab and gave the order, and they all got into it and drove to police head-quarters.

Willet, who had ridden beside the cabman, got down and went in to seek farther information.

He was gone but a few moments, and then he returned and opened the door of the cab and spoke to the General.

“It is very lucky we called here first, sir; else we might have been fatally misled.”

“Why? what’s the matter?” inquired the General.