“When he comes along hail him. Say ‘Good evening, Senator.’ I’ll hear you.”

Clancy promptly moved off along the path which runs parallel with the railway. Nolan, though puzzled, put no questions, being well aware he would be told nothing more.

Three gentlemen came down the cliff, and crossed the bridge. One was Van Hofen himself. Now, the fates had willed that Ronald Tower should come next, and alone. He was hurrying. He had seen figures entering the club, and wanted to join them in the gig.

The policeman made the same mistake as many others.

“Good evenin’, Senator,” he said.

Tower nodded and laughed. He had no time to correct the harmless blunder. Even so, he was too late for the boat, which was already well away from the stage when he reached it. He lighted a cigarette, and strolled along the narrow terrace between river and lawn.

Clancy, on receiving his cue, followed Tower. An attendant challenged him at the iron gate, but Nolan certified that this diminutive stranger was “all right.”

It was on the tip of the detective’s tongue to ask if Mr. Meiklejohn had gone into the clubhouse when he saw, as he imagined, the Senator’s tall form silhouetted against the vague carpet of the river; so he passed on, and this minor incident contributed its quota to a tragic occurrence. He heard some one behind him on the bridge, but paid no heed, his wits being bent on noting anything that took place in the semi-obscurity of the river’s edge.

Meanwhile, the patrolman, encountering a double of Senator Meiklejohn, was dumbfounded momentarily. He sought enlightenment from the attendant.

“An’, for the love of Mike, who was the first wan?” he demanded, when assured that the latest arrival was really the Senator.