Britz invited him to enter.
"Collins, this is Detective Hastings," said Britz in introduction.

"You will remain in his custody for the present! Hastings,"-- he addressed the detective--"if this man tries to elude you, arrest him and bring him to Headquarters." Britz left the apartment, an exultant gleam in his eye.

The long interview with Collins, even the intervention of Luckstone, had brought him closer to the final unraveling of the absorbing mystery that had developed so many amazing complications.

As he hastened toward the subway station, he was fired by a sense of imminent triumph, felt the first happy thrill of approaching victory.
It was no vain boast in which he had indulged before the crafty Luckstone.

The detective had been following a carefully devised plan through his investigation, and he was about to reap the fruits of his industry.