Books in the Horatio Lyle series

In Victorian London at the height of the industrial revolution, Horatio Lyle is a former Special Constable with a passion for science and invention. He's also an occasional, but reluctant, sleuth. The truth is that he'd rather be in his lab tinkering with dangerous chemicals and odd machinery than running around the cobbled streets of London trying to track down stolen goods. But when Her Majesty's Government calls, Horatio swaps his microscope for a magnifying glass, fills his pockets with things that explode and sallies forth to unravel a mystery of a singularly extraordinary nature.Thrown together with a reformed (i.e. 'caught') pickpocket called Tess, and a rebellious (within reason) young gentleman called Thomas, Lyle and his faithful hound, Tate, find themselves pursuing an ancient Chinese plate, a conspiracy that reaches to the highest levels of polite society and a dangerous enemy who may not even be human. Solving the crime will be hard enough - surviving would be a bonus...

London, 1865, and young Theresa Hatch (Tess, to her friends) receives a nast surprise late at night. When Horatio finds a young girl on his doorstep, passed out, dying - apparently poisoned - he's appalled. Investigations lead to Tess's old workhouse, but a surprise visit to that sorry establishment yields more questions than answers. Only one thing is clear: something very, very bad is happening to the children in the East End.There's a mystery to be solved, sending Lyle, Thomas, Tate and - naturally - Tess out into the wilds of east London and a certain former thief's old stamping grounds. What they find is terrifying: Tess's old crowd of artful dodgers and ace pickpockets are now wandering the streets like zombies, drooling in the workhouses or plain mad in the asylum. And it isn't just affecting Tess' old crowd; children all over the area are turning up with their memories in tatters and their minds all but gone. The only clue is a name, half-whispered in fear: Old Greybags.