“Well quoted, my boy!” exclaimed the old pedagogue, in deep satisfaction.

“Let’s follow the music boat,” suggested Brad. “That singing has stirred up something a whole lot inside of me. I sure would like to hear some more.”

So Reggio was instructed to follow the musicians.

Some fifteen minutes later, perhaps, the music boat turned into a narrow, close canal, where all was darkness and gloom, with never a gleam of light, save from the gondolas, where lamps twinkled and moved like wills-o’-the-wisp. The boats were lost in the blackness of the place, the lights alone marking their movements.

“Another right fine place for a race with death, pard,” whispered Brad.

“Why have they turned in here?” whispered the professor apprehensively.

“We’ll find out,” said Dick. “We must be close to the Bridge of Sighs. Yes, you can see it against the sky. There it is.”

“With a palace and a prison on either hand,” murmured Zenas.

The beautiful bridge could be seen, buttressed by two great hulks of gloom. It was a ghostly place, and the cool air of the night seemed to take on a deeper chill.

The music barge floated beneath the arch of the bridge and stopped. Reggio permitted his gondola to slowly move along until it was also beneath the bridge. Above them was the terrible prison. Beneath them was the dark and sluggish waters. Dick thought of the headless bodies that once had awaited the changing tide that was to bear them away from that bloodstained spot to outer sea.