Published by Chronicle Books 

Summary:  10-year-old Charlotte lives in England in 1940.  She and her best friend Kitty love to hear Charlotte’s father talk about the work he does researching time travel.  As World War II intensifies, his work becomes more and more secretive, until one night Charlotte and Kitty are kidnapped by Nazis and taken to her father’s lab.  The Nazis threaten to shoot the two girls if her father doesn’t tell them the secrets of time travel.  At the last second, much to her amazement, Charlotte sees a time-travel portal like her father has described to her many times before.  She runs through it, and finds herself in 2013 Wisconsin.  Knowing she can never travel back to her original time, she does the best she can to make a new life for herself, but she never forgets about Kitty.  Just when she has given up all hope of ever finding her, she opens a library book and finds a postcard from an adult Kitty, which just might be the clue she needs to reconnect.  272 pages; grades 4-7.

Pros:  An enchanting mix of friendship story, historical fiction, and science fiction.

Cons:  Be prepared to suspend some disbelief for the time travel portions of the story..