'Whispers Underground' continues PC Peter Grant's architectural romp around London. This time focusing on the London underground. The Folly gets a new apprentice in PC Leslie May and the two of them team up to try and solve a murder that occurred in the Tube System as well as continuing the search for the "Faceless Man" from the last book. Throw in some half fae, magical markets, an over eager FBI agent, some sexual tension and magic battles and you have the recipe for another great book from Aaronovitch.
I really enjoyed the first 2/3rds of the book, it was everything I've come to love about this series. Fast paced, witty, learning about London and Police work. Unfortunately though the last third was a bit of a mess and really a bit of a let down for me. The plot just round down without much of a climax and Aaronovitch was intertwining the Faceless man plot with the Murder plot. That really didn't work for me and the result was that 'Whispers' was more like a middle book of a trilogy than a self contained serial novel.
Don't get me wrong, I still really enjoyed, but it wasn't as good as 'Moon over Soho'.