An easy death

After the assassination of FDR in the 1930s, the US collapses and is picked off by the UK, Canada, Mexico, and Russia. We find ourselves in the Southwestern states, now known as Texoma. It is here that the gunnie Lizbeth Rose tries to piece out a life, running security on runs from Texoma across the border to Mexico, where work and prospects are stronger. When two Russian magicians come looking for a man named Alex Karkarov, they hire Lizbeth to find him or his family, but there are problems: The man they're looking for is dead, but he has a daughter they now need to find, as an ever-growing set of sorcerers and gunnies do not want them to succeed. It's a good thing Lizbeth is a deadly gunfighter; too bad she hates sorcerers, even the ones on whom she has to learn to rely.