William Monk 15 - Dark Assassin

came from Argyll, you say?”
    “Yes.”
    “If he says it was for wages, or a new machine, and that Sixsmith misappropriated it, can you prove he’s lying?”
    Monk felt his muscles tighten defensively. “No, not beyond a doubt.”
    “Reasonable doubt?”
    “I don’t know what doubt is reasonable. I’m certain myself.”
    “Not exactly relevant,” Rathbone said dryly. “Why would Argyll want Havilland dead so much that he would be prepared to use Sixsmith to hire an assassin?”
    “Knowledge that the tunnels were dangerous and work should be stopped,” Monk replied.
    “Isn’t all such work dangerous? The Fleet sewer collapse was appalling.”
    “That’s cut-and-cover,” Monk told him. “Imagine that underground, possibly collapsing at both ends, with water, or worse—gas.”
    “Is gas worse? I would have thought water would be pretty dreadful.”
    “The gas would be methane. That’s flammable. It would only need one spark and the whole thing would be ablaze. If it came up through the sewers, it could start another Great Fire of London.”
    Rathbone paled. “Yes, I have the idea, Monk. Why do you think that is anything more than a madman’s nightmare? Surely Argyll wouldn’t want that any more than Havilland or anyone else. If it were a real danger, he’d stop the work himself. What was he afraid of—that Havilland would frighten the workforce and they’d strike? Why not just bar him from the site? Isn’t murder excessive, not to mention dangerous and expensive?”
    “If it wasn’t the navvies Havilland was going to, but the authorities, that would be different. He couldn’t stop that so easily. And even an unfounded fear could close the excavations for enough time to delay the work seriously and cost a great deal of money. To a ruthless man, one perhaps running rather close to the edge of profit and loss, or with an over-large investment, that could be motive for murder.”
    Rathbone frowned. “But motive is not enough, Monk, which you know as well as I. Why not suppose it was Sixsmith, exactly as it appears to be?”
    “Because it was Argyll’s wife who sent the letter to her father asking him to be in the stable after midnight,” Monk answered decisively. “At Argyll’s request.”
    “And if Argyll says he did not ask her to write it?” Rathbone asked.
    “You cannot force her to incriminate him. It would be profoundly against her interest.”
    “Others will swear it is her handwriting.”
    “You have the letter?”
    “I don’t. I have the envelope.”
    “The envelope! For God’s sake, Monk! Anything could have been in it! Did anyone see the letter? Is the envelope postmarked?”
    Monk felt the argument slipping out of his grasp. “The envelope was hand delivered,” he replied levelly. “But it is beyond reasonable doubt that it was the one he received that evening, because he made notes on it in his own hand, and it was in the pocket of the jacket he was wearing. That’s where we found it.”
    “Could it have belonged to another letter sent at an earlier time?”
    “There were notes on it relating to events that happened that evening,” Monk replied with satisfaction.
    “Good. So Mrs. Argyll sent him a note. If she swears it was an invitation to dinner in a week’s time, and she is willing to, what have we?”
    “A woman prepared to lie to two police officers, under oath.”
    “To save her husband, her home, her source of income, and her position in society—and thus also her children.” Rathbone puckered his mouth into a tight, bleak smile. “Not an unusual phenomenon, Monk. And not one you would find it easy, or popular, to destroy. You would not win the jury’s favor with that.”
    “I want their belief, not their favor!” Monk snapped.
    “Juries are driven by emotion as well as reason,” Rathbone pointed out. “You’re playing a dangerous game. I can see about charging Sixsmith as an accessory, possibly an unknowing one as far as murder is concerned, and hope to draw out enough to implicate Argyll, but you’d have to come up with a lot more than you have so far.” His face pinched a little. “It happens sometimes. You can catch everyone but the real culprit. It looks as if Argyll’s protected himself pretty well. To reach him you’ll have to destroy this man Sixsmith, who may be completely innocent of anything except a fairly usual business bribe. You’ll also destroy Argyll’s wife, who is doing what any woman would do to protect her