Carrie Vaughn’s 2012 Steel is a standalone young-adult time travel story.
Jill Archer comes in fourth in her fencing tournament. Third would have earned her a bronze medal and a place in the Junior World Fencing Championships. Fourth gets her nothing.
A family vacation near Nassau should help her get over the setback. But a chance discovery of the broken tip of a rapier, lost to the sea centuries ago, gives her a ticket to an entirely different sort of vacation. Clutching the fragment she has rescued from the water, she falls overboard in the 21st century. She is hauled out of the water in the golden age of piracy.