Hetherwick pulled out The Times and pointed to the advertisement.
"I want you to go down to Dorking to-morrow morning and personally interview Lady Riversreade in response to that," he said. "You've all the qualifications she specifies, so you've an excellent excuse for calling on her. Whether you'd care to take the post is another matter—what I want is that you should see her under conditions that will enable you to observe her closely."
"Why?" asked Rhona.
"I want you to see if she wears such a band as that which Hudson told Hollis and myself about," replied Hetherwick. "Sharp eyes like yours will soon see that. And—if she does, then she's Mrs. Whittingham! In that case, I might ask you to do more—still more."
"What, for instance?" she inquired.
"Well, to do your best to get this post," he answered. "I think that you, with your qualifications, could get it."
"And—your object in that?" she asked.
"To keep an eye on Lady Riversreade," he replied promptly. "If the Mrs. Whittingham of ten years ago at Sellithwaite is the same woman as the Lady Riversreade of Riversreade Court of to-day, then, in view of your grandfather's murder, I want to know a lot more about her! To have you—there!—would be an immense help."
"I'm to be a sort of spy, eh?" asked Rhona.
"Detective, if you like," assented Hetherwick. "Why not?"