But Dick's roving gaze soon made out, several yards away, a man in brown, wearing a gray overcoat.

The fellow was marching along with the throng as though he, too, were an idle spectator.
"That's the fit-thrower's other friend," flashed through Dick's mind.
"He must have been the fellow who spoke behind me just now, too." "Oh, let's not go any further," proposed Tom Reade.

"We've seen folks arrested before this." "Come along," said Dick shortly, not caring to explain his reasons just at this moment.
So the chums kept on in the wake of the crowd.

A block further on a uniformed policeman stepped forward to have a look at Whalen's prisoner.
"Moll-buzzer," explained Policeman Whalen briefly to his brother of the force.

A "moll-buzzer" is a thief who robs women in crowds.
The uniformed policeman fell back and the crowd moved forward, but Dick seized the second policeman's coat sleeve.
"There's another of the gang," whispered Dick, pointing to the black-moustached man in the gray overcoat.
"Are you sure ?" demanded officer number two.
"Positive," whispered Dick.