midnight
This is getting more and more mysterious ! We must be on our guard all the while . Well , I 'll see what I 'll do in the morning . '' But in the morning the man with the black mustache was not aboard the train , and on inquiring of the conductor , Tom learned that the mysterious stranger had gotten off at a way station shortly after midnight . `` Bless my penknife ! '' exclaimed Mr. Daman , the next morning , when he had been told of Tom 's experience in the night , `` things are coming to a pretty pass when our enemies adopt such tactics as this ! What can we do , Tom ?