Rysa Walker, Timebound

I enjoyed this YA book about a teenager, Kate, who finds out from her grandmother that she has the ability to travel through time. Turns out she's the only one who can save the world as it is from nefarious elements bent on changing the timeline to their advantage. She winds up time-hopping back to the Chicago World's Fair in 1893 to set things right. If you've read The Devil in the White City, you'll remember that the Chicago Exposition was the hunting ground of serial killer H.H. Holmes, so it wasn't a particularly safe place to be....