The assassin must be somewhere ahead of them, but the thought of leaving Scuff and going after him never entered Monk's head. Clumsily, because of the lantern, and trying to carry Scuff gently with only one arm, he turned and began the long way back. He walked in the center of the sewer floor, where he could move the most easily. He had very little idea where he was, and his only thought was to find the way up towards help.

He did not know how badly Scuff was hurt, but he could not stop here to find out. There were rats everywhere, and they would smell blood. Far worse than that, the assassin knew he had hit Scuff. The fact that Monk had not followed him would tell him that Scuff was not dead and that Monk was trying to get back up again, hampered by carrying a wounded child. As soon as he was certain of that, would he double back and try to finish Monk off? If the positions were reversed, Monk would!

He was lost. There was a fork again: three ways, two ahead, one behind him. Which way had he come? Think! Scuffs life depended on it! The water was flowing around his feet quite rapidly. It must have kept raining all day. What happened if it got harder, heavier? Flash floods, of course! Deep water. Enough to pull him off his feet, maybe even drown him and Scuff. Was it still raining? He could feel the panic rising inside him. He commanded himself to stop behaving like a fool, and think.

Water flows downwards. On the way in, had he been going with the flow or against it? With it, of course. Down, all the time, down. So he had to go back against it now, upwards. It didn't matter anymore where he emerged, as long as it was into the air and he could get help. Any opening would do.

He started forward again. Scuff was growing heavy held on one arm, but he had to hold the lantern high in order to see. Its weight was pulling on the wound from the fight on Jacob's Island. One good thing: If he was simply going up, and not necessarily retracing the way he had come, then there was no trail for the assassin to follow.

As Monk trudged upwards, his mind was working. Why had the killer never gone back to Sixsmith for the second half of his payment, nor apparently to Argyll, either? Perhaps he had never expected to collect the second half; he might have asked for what he meant to have in the first payment. Maybe he feared that Argyll meant to kill him, tidy up the ends. Was he right?

Rathbone would have to drop the prosecution or risk hanging Sixsmith, and Argyll would escape. Neither Mary nor her father would ever be vindicated.