Bronze Summer continues the alternate history begun in Stone Spring, where the British Isles remains joined to continental Europe, and what in our history became the North Sea became instead home to a prosperous Mesolithic community. Bronze Summer fast-forwards 8000 years to the Bronze Age, where Northland has become a cultural and economic power on a par with Mycenae, Troy and the city states of Mesopotamia.
Bronze Summer shares many of Stone Spring's flaws, but few of its qualities. On the positive side, Baxter does write good prose, and keeps the story moving along at a brisk pace. He writes interesting characters - the "goodies" have fatal flaws, and the "baddies" have plausible reasons for doing what they do. But the main dynamic of the story is almost identical to Stone Spring, just with a bronze age setting rather than a stone age one, and a different world-altering natural catastrophe.
But the biggest turn off for me - so much so that I just gave up reading about four-fifths of the way through - was the relentless depiction of sexual violence and cruelty that permeates the story. Scarcely a chapter goes by without men, women or children being raped, mutilated or otherwise violated and abused. The depictions are clinical rather than voyeuristic, but they add little to the story, and just make it harder to pick the book up again once you've put it down. For contrast, about the same time, I was reading the second book of S.M. Stirling's "Island in the Sea of Time" series. This also deals with the everyday horrors of Bronze Age life, but at least in a way that helps his narrative rather than hinders it.
So on balance I will probably give the third book in the Northland series a miss.