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I'm a sucker for alternative-history whodunnits, and I love ancient British history. In this book, a Saxon cop and a Celtic cop team up to catch a serial killer against the backdrop of the latest British unification summit.
The crime plot with its political elements is well done, the characters are strong and sympathetic. The alt-history is fun and often witty, with the world dominated by the "Pan-African Unified States" and Britain a developing nation, heavily culturally colonised.
It's a bit difficult to follow the exact timeline -- it has to involve Christianity (and Judaism?) being heavily suppressed by the Romans, to the point that hardly anyone in the present day has heard of it, but Islam is present, with a European Caliphate and a Mughal Empire as secondary powers...and how any of that leads to the failure of the Normans to conquer Britain is anyone's guess. The worldbuilding of the alternative present is deft and detailed, though, cleverly twisting the familiar rather than making up new stuff. (Though a reference to Lycra by name raised an eyebrow.)
Generally huge fun, though, and if you liked Cahokia Jazz or The Yiddish Policemen's Union or Dominion, it seems a fair bet you'll enjoy this.