Miss Babette Graumann did not attempt to speak.  In a wave of emotion she stretched out both little hands to the detective and clasped his warmly.  “Oh, thank you,” she said at last.  “I thank you.  He’s just like my own boy to me; he’s all the child I ever had, you know.”

“But there are difficulties in the way,” continued the commissioner in a business-like tone.  “The local authorities in G—­ have not asked for our assistance, and we are taking up the case over their heads, as it were.  I shall have to leave that to Muller’s diplomacy.  He will come to G—­ and have an interview with your nephew.  Then he will have to use his own judgment as to the next steps, and as to how far he may go in opposition to what has been done by the police there.”

“And then I may go back home?” asked Miss Graumann.  “Go home with the assurance that you will help my poor boy?”

“Yes, you may depend on us, Madam.  Is there anything we can do for you here?  Are you alone in the city?”

“No, thank you.  There is a friend here who will take care of me.  She will put me on the afternoon express back to G—.”

“It is very likely that I will take that train myself,” said Muller.  “If there is anything that you need on the journey, call on me.”

“Oh, thank you, I will indeed!  Thank you both, gentlemen.  And now good-bye, and God bless you!”

The commissioner bowed and Muller held the door open for Miss Graumann to pass out.  There was silence in the room, as the two men looked after the quaint little figure slowly descending the stairs.

“A brave little woman,” murmured the commissioner.

“It is not only the mother in the flesh who knows what a mother’s love is,” added Muller.

Next morning Joseph Muller stood in the cell of the prison in G—­ confronting Albert Graumann, accused of the murder of John Siders.

The detective had just come from a rather difficult interview with Commissioner Lange.  But the latter, though not a brilliant man, was at least good-natured.  He acknowledged the right of the accused and his family to ask for outside assistance, and agreed with Muller that it was better to have some one in the official service brought in, rather than a private detective whose work, in its eventual results, might bring shame on the police.  Muller explained that Miss Graumann did not want her nephew to know that it was she who had asked for aid in his behalf, and that it could only redound to his, Lange’s, credit if it were understood that he had sent to Vienna for expert assistance in this case.  It would be a proof of his conscientious attention to duty, and would insure praise for him, whichever way the case turned out.  Commissioner Lange saw the force of this argument, and finally gave Muller permission to handle the case as he thought best, rather relieved than otherwise for his own part.  The detective’s next errand was to the prison, where he now stood