Do you understand ?" "Y-yes," said Markel hoarsely.
"No," said Jimmie Dale sadly, "I don' think you do.

Let me be painfully explicit.

If you break your vow of silence by so much as a second, then to-morrow, or the next day, or the day after, at my convenience, Markel, you and I will meet again--for the LAST time.

There can be no possible misapprehension on your part now--Markel ?" "N-no,"-- Markel could scarcely chatter out the word.
"Quite so," said Jimmie Dale, in velvet tones.

He stood for an instant looking at the other with cool insolence; then: "Good-night, Markel"-- and five minutes later a great touring car was tearing New Yorkward over the Long Island roads at express speed.
It was one o'clock in the morning as Jimmie Dale swung the car into a cross street off lower Broadway, and drew up at the curb beside a large office building.