As others say, there's not much mystery here. But I enjoyed the atmospheric story of 1750's London street life, the new civil police, religious conspiracies and debate, criminal jurisprudence, and the effects of windstorms. I liked the contexts provided for famous but hitherto isolated things like Bedlam, Co(n)vent Gardens, coffehouses, Boswell's Samuel Johnson, Henry Fielding (Tom Jones), and the famous Grub Street itself (scene of the bloodiest events). The writing is quite "proper" and rather sentimentalizes boy hero Jeremy, aide to the blind Judge Fielding, but includes an intriguing dollop of the "flash" street slang of the day, in the person of a street urchin who one hopes becomes a regular in the series. In an odd way the major events of the second half, when the evil genius has been singled out, are a reprise of the first: the type of murder, the undertaker, the street vendor, the reformed prostitute, the urchin, all come back rather as goody-goodies.