And yet——
Well, the woman seen by them both was gone, and that was all there was to it.
The whole expanse of the rear of the Trinity church-yard, toward which she had moved, now lay spread out before them.
If her gliding figure had vanished into thin air it could not have disappeared more effectually than it had.
"Come," said Hook, abruptly moving at the same time toward the low wall on the Rector street side, "there's no use in remaining longer; we shall learn nothing here to-night."
Gaining the fence, he vaulted lightly to the street.
Frank, following his example, stood by his side.
"Well, which way are you going?" asked the detective. "I am tired, and off for home."
"Oh, I stay with some friends to-night."
"Friends! What friends? Be careful. If we are going to work together, you must follow my instructions to the letter. Are you sure of these friends of yours? Won't they give you away?"