As soon as I reached my room I pulled out my Latin notes and checked the stuff about Roman names. Which, I’d learned, often have three bits – praenomen, nomen and cognomen – and, if you can read your own handwriting, tell you a lot about the individual. Verica wasn’t a Latin name; I suspected it was British, and Tiberius Claudius were the first two names of Tiberius Claudius Caesar Augustus Germanicus, otherwise known as Emperor Claudius, him who was in charge when Britain was first conquered by the Romans. The Empire liked to co-opt the local ruling elite wherever possible – it being easier to get your leg over a country if you forked out for dinner and a dozen roses first. One of the bribes on offer was Roman citizenship, and many who took up that offer kept their native name and prefixed the praenomen and nomen of their sponsors – in this case the Emperor. Thus, just from the evidence of his name, Tiberius Claudius Verica was an aristocratic Briton who lived around the time the city was founded.

Which meant nothing, as far as I could tell. If I survived the next hour or so, I planned to have a word with Mama Thames about it. But I had more immediate problems.

*

In 1861 William Booth resigned from the Methodists in Liverpool and headed for London where, in the grand tradition of metropolitan reinvention, he founded his own church and took Christ, bread and social work to the heathen natives of east London. In 1878 he declared that he was tired of being called a volunteer and that he was a regular in the army of Christ or nothing at all; thus the Salvation Army was born. But no army, however pure its motives, occupies a foreign country without resistance, and this was provided by the Skeleton Army. Driven by gin, bone-headedness and growling resentment that being the Victorian working class was bad enough without being preached at by a bunch of self-righteous northerners, the Skeleton Army broke up Salvation Army meetings, disrupted marches and attacked its officer corps. The emblem of the Skeleton Army was a white skeleton against a black background – a badge worn by right-thinking ne’er-do-wells from Worthing to Bethnal Green. I’d spotted one on the ghostly form of Nicholas Wallpenny, a candidate for the Skeleton Army if ever there was one, and it was this badge that I’d recovered from the graveyard of the Actor’s Church. Nightingale had said that I was going to need a spirit guide, and in the absence of mystical bears, coyotes or whatever, a larcenous cockney was going to have to do.