She snatched the note from him, and there on the back were traced in ink the words, "Back Flat-Iron." "One of the notes," said Keith hoarsely. "One of the notes stolen on that night by the person who murdered Jacob Lazarus." Eugénie had also risen to her feet and her face wore a look of horror. She looked at her lover, and he looked back again, with the same name in their thoughts. "Kitty Marchurst!" "Good God!" said Stewart, moistening his dry lips with his tongue, "can she be guilty, after all?" "I can't believe it," said Eugénie determinedly, "though Naball says he thinks she did it. But I certainly got this note from her." "She may have received it from some one else," cried Keith eagerly. "God knows, I don't want to die myself, but to put the rope round the neck of that unhappy woman--horrible," and he covered his face with his hands. Eugénie put on her gloves, and then touched his arm. "I'm going," she said in a quiet voice. "Going?" he repeated, springing to his feet. "Yes, to see Naball, and show him the note." "But Kitty Marchurst!" "Don't trouble about her," said Eugénie, a trifle coldly. "She is all right, and I've no doubt can explain where she got this note. Wherever it was, you can depend it was not from the dead man's safe. Good-bye, Keith," kissing him. "This note gives us the clue, and before many days are over you will be free, and the murderer of Jacob Lazarus will be in this cell." CHAPTER XXVI. ON THE TRACK. When Eugénie left the prison, she went straight to Naball's office, and finding him in, told all about the wonderful discovery of the veritable five-pound note endorsed in Isaiah's writing. To say that Naball was astonished would be a mild way to state his feelings on receipt of this intelligence. "It's an uncommon piece of luck," he said, looking at the note; "we might have searched for a twelvemonth, and never come across this piece of evidence. I think we'll get to the bottom of things this time. You got it from Kitty Marchurst?" "Yes, I got it yesterday in payment of my salary" Naball whistled softly. "Things look uncommon black against that young woman," he observed thoughtfully. "I didn't half believe that story of hers about Stewart's stealing the diamonds, and now this note turning up in her possession--humph!" "But you don't think she's guilty?" said Eugénie, clasping her hands. "I don't say anything," replied Naball savagely, for the difficulties of this case were beginning to irritate him. "I only say things look black against Caprice--she's as deep as a well." "What are you going to do now?" asked Miss Rainsford in a trembling voice, as she rose to go. The detective placed his hat jauntily on one side of his head, drew on his gloves, then taking his cane, walked to the door of the office, which he he held open for Eugénie to pass through. "What are you going to do now?" she repeated when they were standing in the street.