“Ah! then we have a motive,” said the detective.

“There is a motive, but it is not Miss Cavendish,” Croyden answered. “You’re correct as to the abduction, however—this will explain,” and he handed him the letter.

The two men read it.

“When did you receive this?” said one.

“At noon to-day,” replied Croyden, passing over the envelope.

They looked carefully at the postmark.

“Do you object to explaining certain things in this letter?” Rebbert asked.

“Not in the least,” replied Croyden. “I’ll tell you the entire story.... Is there anything I have missed?” he ended.

“I think not, sir.”

“Very well! Now, we prefer that you should take no measures to apprehend the abductors, until 309 after Miss Cavendish and Miss Carrington have been released. We are going to pay the amount demanded.”