Dies the Fire

Blurb

Dies the Fire is a 2004 alternate history and post-apocalyptic novel written by S. M. Stirling. It is the first installment of the Emberverse series and is a spin-off from S. M. Stirling's Nantucket series, where the Massachusetts island of Nantucket is thrown back in time from March 17, 1998 to the Bronze Age.
In Dies the Fire, S. M. Stirling chronicles the struggle of two groups who try to survive "The Change", a mysterious worldwide event that suddenly alters physical laws so that electricity, gunpowder, and most other forms of high-energy-density technology no longer work. As a result of this, modern civilization comes crashing down.