20th century 
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There are a total of 145 valid entries on the list.
1. Caught
Author:
Series:
The missing volume 5.
Average Rating:
5 stars
Description:
When Jonah and Katherine travel to early 1900s Switzerland and Serbia to return Albert Einstein's daughter, Lieserl, to history, her mother Mileva grasps entirely too much about time travel and has no intention of letting her daughter go.
2. The trap
Author:
Average Rating:
3.3 stars
Notes:
Strange, but good all the same. Four kids figure out how to leave their bodies while sleeping, but it's not creepy at all. Lots of friendship and teamwork. First crushes.
Formats:
Description:
In 1963, when twins Henry and Helen and their best friends, Alan and Nicki, try to find Alan's missing brother, Carl, they stumble into the knowledge of their "subtle forms" that can separate from their physical bodies, and into a criminal's plot to make himself immortal--at any expense.