"Isaiah," said Naball and Ezra with one voice, and then looked at one another, amazed at this new discovery.
"By Jove!" said the detective, "this is becoming exciting. You are sure you heard the boy say that?"
"Yes, I'm sure--quite sure," answered Eugénie firmly; "but I don't think that could prove Caprice guilty. Much as I wish to serve Keith, I don't want to ruin her."
Naball glanced at her keenly, then turned to Ezra.
"Send for the boy," he said sharply, "and we'll find out all about Caprice's visits to your father's place."
"It mightn't have anything to do with the murder," said Ezra, ringing the bell for the messenger.
"True," replied Naball, "but, on the other hand, it might have a good deal to do with the diamond robbery."
[CHAPTER XXIII.]
THE CYPHER.
When the messenger had been despatched, Naball drew his seat up to the table, and began to make some notes, after which he turned to Eugénie.