Matthew Hawkwood is a Bow Street Runner in the early 19th century. He's called on to investigate a stagecoach robbery and later to help out in the case of a disappearing clockmaker. It will surprise no reader of crime fiction that the two cases turn out to be related, though just how won't be quite so easy to figure out.
Ratcatcher has a lot going for it. The London setting is described in all its glory, from the high life to the low. Mostly low, and the sights, smells, sounds are everywhere. You want sex, adventure, duels, fisticuffs, fires, and derring-do? You got 'em, and in plenty.
The story became a little too James Bond in the 19th century for me, but it was a fine ride, and I've already ordered McGee's second book in the series, Resurrectionist, and I'm looking forward to see where it takes Hawkwood and the colorful cast of characters he hangs about with.