The cab was called, and they went to Undercliff. On the way Helen brooded; but the detective eyed every man and everything on the road with the utmost keenness. Edward Undercliff was at work at lithographing. He received Helen cordially, nodded to Burt, and said she could not have a better assistant. He then laid his fac-simile of the forged note on the table, with John Wardlaw's genuine writing and Penfold's indorsement. "Look at that, Mr. Burt." Burt inspected the papers keenly. "You know, Burt, I swore at Robert Penfold's trial that he never wrote that forged note." "I remember," said Burt. "The other day this lady instructed me to discover, if I could, who did write the forged note. But, unfortunately, the materials she gave me were not sufficient. But, last night, a young man dropped from the clouds, that I made sure was an agent of yours, Miss Rolleston. Under that impression I was rather unguarded, and I let him know how far we had got, and could get no further. 'I think I can help you,' says this young man, and puts a letter on the table. Well, Mr. Burt, a glance at that letter was enough for me. It was written by the man who forged the note." "A letter!" said Helen. "Yes. I'll put the letter by the side of the forged note; and, if you have any eye for writing at all, you'll see at once that one hand wrote the forged note and this letter. I am also prepared to swear that the letters signed Hand are forgeries by the same person." He then coolly put upon the table the letter from Arthur Wardlaw that Helen had received on board the _Proserpine,_ and was proceeding to point out the many points of resemblance between the letter and the document, when he was interrupted by a scream from Helen. "Ah!" she cried, "he is here. Only one man in the world could have brought that letter. I left it on the island. Robert is here. He gave you that letter." "You are right," said the expert, "and what a fool I must be! I have no eye except for handwriting. He had a beard; and such a beard!" "It is Robert!" cried Helen, in raptures. "He is come just in time." "In time to be arrested," said Burt. "Why, his time is not out. He'll get into trouble again." "Oh, Heaven forbid!" cried Helen, and turned so faint she had to be laid back on a chair, and salts applied to her nostrils. She soon came to, and cried and trembled, but prepared to defend her Robert with all a woman's wit. Burt and Undercliff were conversing in a low voice, and Burt was saying he felt sure Wardlaw's spies had detected Robert Penfold, and that Robert would be arrested and put into prison as a runaway convict. "Go to Scotland Yard this minute, Mr. Burt," said Helen, eagerly. "What for?" "Why, you must take the commission to arrest him. You are our friend." Burt slapped his thigh with delight.