They turned off Barque Street onto Manchester Road, passing a group of dockers going down towards the ferry. On the corner a one-legged sailor was selling matches. A running patterer jogged towards Ship Street corner, turned and disappeared.

“Wastin' our time 'ere.” Benyon pulled a face. “I'll ask at the Cubitt Town pier. That's about the best place ter start.”

They walked in silence past the Rice Mill and the Seysall Asphalt Company and made an acute right down to the pier. The cry of the gulls above the water came clearly over the rattle of wheels and the shouts of dockers handling bales of goods, bargees calling to one another, and the endless hiss and slap of the tide.

Monk hung back, not to intrude into Benyon's questioning. This was his area and he knew the people and what to say, what to avoid.

Benyon came back after several minutes.

“Not bin 'ere terday,” he said, as if it proved his point.

Monk was not surprised. He nodded, and together they proceeded along Manchester Road past the Millwall Wharf, Plough Wharf, as far as Davis Street, then turned right and then left into Samuda Street. They stopped for a pint of ale at the Folly Tavern, and there at last heard news of Caleb Stone. No one admitted to having seen him at any specific time lately, but one little rat of a man with a long nose and a walleye followed them out and discreetly, at a price, told Benyon that Caleb had a friend in a tenement house on Quixley Street, off the East India Dock Wall Road, about three quarters of a mile away.

Benyon passed over half a crown and the man almost immediately disappeared across the alley and into the Samuda Yard with its piles of timber.

“Is that worth anything?” Monk asked dubiously.

“Oh yeah,” Benyon replied with conviction. “Sammy 'as one or two 'ostages ter fortune. 'E won't lie ter me. We'd better find the sergeant. This'll need at least ' alf a dozen of us. If you'd seen Quixley Street yer'd not doubt that.”

It took them over an hour and a half to find the pair from Limehouse and for all five of them, including the sergeant, to get to Quixley Street, which was a narrow throughway hardly a hundred yards long backing into the Great Northern Railway goods depot, just short of the first East India Dock. Two men were sent to Harrap Street at the back, and Benyon to Scamber Street at the side. The sergeant took Monk in at the front.

It was a large building, four stories high with narrow, dirty windows, several of them cracked or broken. The dark brick was stained with damp and soot but only one of the tall chimney stacks smoked, dribbling a fine gray-black trail into the cold air.