He had left the theater the moment Cervera concluded her performance,
and since had completed a perfect disguise in the cab, which he had had
in waiting, with all the properties for effecting the change mentioned.

That Patsy would constantly keep their quarry in view, and without being
suspected, Nick had not a doubt. Nor was he mistaken. At the end of
twenty minutes the clever young driver slowed down upon approaching an
uptown corner, and signaled Nick to get out.

The detective alighted from the door on the side from which he had
received the signal, yet the cab did not stop. Nick trotted along beside
the vehicle for a rod or two, keeping it between him and the side street
into which Patsy quickly signed that the hack had turned.

"Fourth house on the right," he softly cried. "I saw them pull up at it
just as I reached the corner, so I kept right on up the avenue. They've
not gone in yet."

"Good enough," replied Nick, approvingly. "Take home the traps I have
left in the cab."

"Sure thing. You don't want any help to-night against this push, do
you?"

"No, indeed. There'll be but little doing to-night, I imagine. Remember
the house, however, in case I fail to show up."

"You may gamble on that, sir. I have it down pat."