Christine Stewart is a regular woman just doing her job when she gets stranded in history. When she gets up for the day, her plan is simple: go to work, travel back in time to the year 1867 to deport a cyber-criminal, then head back to her time in 2070 LA to vacation with her son. Then the system goes down and she's stranded without supplies.
Trying to think of another story where a guy's deliberately goes back for a one way trip in time. THOUGHT it was by William R. Forstchen, the same guy who did One Second After. Checked Ebay and there's almost 1,500 books being sold by people there, so I wasn't about to go lookin', but checked his website and nothing there rang a bell. The book's 20 some years old and is in "The Shed" with a bunch of others.
S. African is going black (like I said, it's an OLD story) and some white S. Africans are NOT happy about whites no longer controlling everything, along with the U.S. and its embargos. One of them figures how to make a machine that would allow ONE person go to back in time and ONLY one because after that, the machine self destructs because of the amount of power it needs to do this. At least I think it went this way. He comes to the U.S., where he steals a Sterling machine gun, which was the same type the Brits gave to the French Resistance fighters during WW 2 from the Smithsonian. He also takes the blueprints on how to make one. His plan is to take machine gun and plans to the south so the Confederates can win the War Between The States, becoming it's own nation, along with slavery still being legal. If this happens, there's no way they'd allow S. Africa go black. He also has a bunch of gold with him. U.S. govt. gets wind of this and believes it's possible that time travel is possible and that this guy did go back in time....but why did he fail? Or are the time repercussions slowly happening, but how long will it take? So a black guy volunteers to go back in time with the governments one way time machine to stop this guy.