It was impossible for the men not to take notice of the barking of the engines at last.
"The thing's headed for us!"
Vroon stared under his palm. It was not credible that pursuit had taken place so quickly. To test yonder man-bird he abruptly changed the course of the launch. The hydroplane veered its course to suit.
Florence heard her name called faintly. One of the men drew his revolver, but Vroon knocked it out of his hand.
"There's the police boat, you fool!"
"Jump!" a voice called to Florence.
She flung herself into the water without the slightest hesitation.
All this came about something after this fashion. When Norton arrived at the foot of Corey Street a boatman informed him that a young woman of his description had got into a fast motor boat and had gone down the river.
"Was there any struggle?"
"Struggle? None that I could see. She didn't make no fuss about going."