“What do you have?” Rathbone said aloud. “Circumstantial evidence—a letter, which has yet to be proved genuine, yet to be dated, and yet to be proved relevant. What else? We already know that Ballinger was on the river near Chiswick. He said as much himself at the time. You say this prostitute wouldn’t tell you who she gave the cravat to, so you can’t connect it to Ballinger. Isn’t it far more reasonable to suppose she gave it to someone she knew? And why would Ballinger kill a wretched creature like Parfitt? You can’t produce a single person who can show that the two men ever even met each other.” He stopped abruptly. He was talking to Monk as if he, Rathbone, were new at this and had no confidence in himself. He knew better. This is why a good lawyer did not instantly represent family: emotions got in the way right from the start.

Arthur Ballinger was not his father. How different it would have been if it had been Henry Rathbone. He would have known passionately and completely that he was innocent.

But, then, Monk would have known it too.

“I’m not supposing personal enmity,” Monk replied, his voice level and quiet. “I have Ballinger at the time, extremely near the place, and a note, which only he could have written, inviting Parfitt to be in his boat to meet with him, for a business venture profitable to Parfitt.”

“Such as what?” Rathbone retorted. “You have no proof of anything. Not even a suggestion.”

“We know what Parfitt’s business was, Oliver. You saw Phillips’s boat; you know perfectly well what they do. If you want me to, I can describe Parfitt’s boat as well, and the children we found there.”

Rathbone felt his control slipping away from him. “You have no evidence that Ballinger was involved,” he pointed out. “Absolutely nothing, or you’d have prosecuted him for it already. I know how desperately you want to catch whoever’s behind the trade.”

“Don’t you?”

“Yes, of course I do! But not enough to risk prosecuting the wrong person. Just because Sullivan accused Ballinger, that doesn’t make him guilty. Perhaps Ballinger was trying to rescue Sullivan from his own foolishness, and he failed. Sullivan might have blamed everybody but himself. We’ve both seen that before.”

“I don’t know why Ballinger would kill Parfitt,” Monk said, still keeping his voice level and under tight control. “I don’t have to know. All the prosecution has to show is that he had the opportunity, he could have had the means, and that he was the one who told Parfitt to be in the boat at that time, for a meeting. If Parfitt hadn’t known him and believed there was a business connection, he wouldn’t have gone.”