“How is this, Rider?” now inquired the officer, who recognized the detective, and was astonished beyond measure by this unexpected arrest.

“She has on her person diamonds that I have been looking for, for over three years, and I cannot afford to let them slip through my fingers after such a hunt as that,” the detective quietly explained.

“It is false!” the woman stoutly and indignantly asserted.  “I wear no jewelry that is not my own property.  Everything I have was either given to me or purchased with my husband’s money.”

“I trust you will be able to prove the truth of your assertions, madame,” Mr. Rider quietly returned.  “If you can do so, you will, of course, have no further trouble.  But I must do my duty.  I have been employed to search for a pair of diamond crescents which properly belong to a person in Chicago.  I have seen such a pair in your ears to-night.  You also wear a cross like one that I am searching for, and I shall be obliged to take you into custody until the matter can be properly investigated.”

Mrs. Vanderheck was evidently very much startled and upset by this information, yet she behaved with remarkable fortitude, considering the trying circumstances.

“What am I to do?” she inquired, again appealing to the policeman attending her.  “The crescents he mentions are mine—­I bought them almost three years ago in Boston.  Of course, I know that I must prove my statement, and I think I can if you will give me time, for I believe I still have the bill of sale in my possession.  I will look it up, and if”—­turning to the detective—­“you will call upon me some time to-morrow you shall have it.”

Mr. Rider smiled, for the unsophisticated suggestion amused him immensely.

“I cannot lose sight of you, madame,” he said, courteously.  “What you have said may be true; I shall be glad, on your account, if it proves so; but my duty to others must be rigidly enforced, and so I am obliged to arrest you.”

“But I cannot submit to an arrest; you surely do not mean that I—­a woman in my position—­am to be imprisoned on the charge of theft!” exclaimed the woman, growing deadly white.

“The law is no respecter of persons or position, madame,” laconically responded the detective.

“What can I do?” Mrs. Vanderheck cried, in a tone of despair.

“Rider, I am afraid you have made a mistake,” the policeman now remarked, in a low tone; “the woman is all right.  I’ve acted as escort for her on such occasions as these for the last two years.”

The detective looked astonished and somewhat perplexed at this statement.

If Mrs. Vanderheck had led a respectable life in New York for two years, and was as well known to this officer as he represented, he also began to fear that he might have made a mistake.

“You are willing to defer the arrest if she can furnish ample security for her appearance when wanted?” the policeman asked, after a moment of thought.