At first Boyne was furious to think that Ena’s visit to Melun, and the payment of that respectable sum, had been of no avail. But next second, he had seen that the only means of escape was to keep up his identity as Mr. Bennett, to temporise with his pursuers, and then to effect an escape. He saw that, at all hazards, he must prevent the pair of blackmailers from facing Ena and Lilla. Therefore, when the Frenchman had expressed that hard determination that he wanted to prevent him from playing any more of his "hellish tricks" upon innocent people, he had stood in his path upon the pavement and replied: "Now, Monsieur Galtier, just pause for a moment—and think! Aren’t you a fool? Céline’s late mistress has been very good to her, and now you come here and create trouble." They were standing together against the railings of Hyde Park, not far from the taxi-men’s shelter. "I wish to create no trouble," declared the Frenchman in very good English. "Only trouble for _you_!" he snarled. "That is extremely kind of you," Boyne retorted. "But if you still continue to threaten me, I shall take measures to protect myself, and also to retaliate." "You have denounced me as a blackmailer!" the Frenchman snapped. "I was wrong," said Boyne apologetically. "I withdraw those words. Naturally at first I believed you wanted more money!" "Then you believed wrong," was the reply. "Our object in coming to London is to see madame and yourself—and to investigate further the death of Monsieur Martin." "Well, that you are perfectly at liberty to do," Boyne said, with affected carelessness. "I have nothing whatever to fear. If you like to waste your time and money, do so." "Céline knows the truth," retorted Galtier. "Then let her go to the police and tell them. The London police pay little heed to the statements of discharged servants, especially if they are foreigners." "Yes, I will go!" cried the French girl excitedly. "You are assassins!—assassins! You—both of you!—killed poor Monsieur Martin!" "I think you will have to prove that," replied Boyne, remaining very calm. "Hush, Céline!" said her lover. "We do not want a fracas in the street!" "Bah! The man thinks we are afraid of him. But we are not! We are here to get at the truth about poor monsieur." "Well, mademoiselle, you are at perfect liberty to institute inquiries," Boyne replied. "But before you go to the police as you threaten, just pause and ask yourself what all this storm in a teacup will profit you and your friend." The vivacious girl shrugged her shoulders. "Remember that madame is your friend," he went on. "She told me that she has recently been in Paris, and called upon you in Melun. Madame, since you left, has several times expressed regret to me that she was abrupt." "Because she believes that I know your secret!" cried mademoiselle, interrupting.