“Very good!” he said, with his grim smile. “I think we shall get them.”

“The tip may be of no value,” said the chief, “but such as it is I give it to you.”

“I feel sure that it is of great value!” said Harry. “We will get our men this time.”

Frequenters of the opium dens sometimes drop from sight for days.

This would easily explain why the Bradys had not heard from the villains before.

The detectives lost no time.

They at once set out for Mott street.

Ah Ling was a character very familiar to them.

There was no shrewder character, no deeper scoundrel in Chinatown than Ah Ling.

The Bradys knew that it would be folly to attempt to gain admittance to his place in their own character.