Time travel books make a person think - very hard.
Miranda, the main character, loves the novel A Wrinkle in Time, so she is open to the idea of time travel.
Strange things start to happen. Miranda gets a note saying, "I am coming to save your friend's life, and my own. I ask two favors. First, you must write me a letter."
The letters keep coming, and Miranda sees that the writer can predict the future.
I like that Miranda has a good mother who cares about where she is and who she is with. She has a good father figure who treats her and her mother with respect and love. She has a friend who for some reason is ignoring her, but she finds ways to be good friends with others. This is a good solid read with a good ending.