Bronze Summer: the Northland Trilogy (Northland Series) Reprint edition

Stephen Baxter?s “imaginative [and] bold? (Daily Mail, UK) Stone Spring drew readers into an alternate prehistoric scenario. Now, thousands of years have passed, and a wall that was built to hold back the sea must now hold back the advancing armies of a reviving Troy.... 

Created by the building of the Wall, Northland has become a society of prosperous, literate, and self-sufficient people. Inhabited from end to end, the Wall is a linear city stretching for hundreds of miles, and a wonder of the world.
 
For millennia, the Wall has also kept the growing empires of the Bronze Age at bay. But a new and turbulent age is dawning. For any wall, no matter how strong, can be breached—particularly from within.…