"Who are you?" came the question.
"Get in your boat, and leave, or down you go! The other two chaps are settled."
"But give us an explanation."
One of the men made a movement to draw his weapon, but the detective called:
"Hold on there, my friend! And now, you fellows, get in your boat, or at the call of three it will be too late!"
"One!" called the detective, and he made one step nearer the men.
"Two!" he called a second later, and he advanced another step.
The men did not wait for the third call, but leaped into their boat.
The detective advanced to the spot where Renie stood, and in a low voice, he said:
"Am I right?"