When You Reach Me by Rebecca Stead
Miranda Hixson 11-6-14 7th
Bring Your Mind Into An Amazing World of Mystery
Then things start to get weird. Sal gets punched by some random kid, then Miranda is suddenly nothing to him. It was like he never met her. Then if that was not crazy enough, Miranda's apartment key gets stolen and suspicious notes start coming.
The notes keep coming and coming until Miranda realizes that whoever is leaving them, is no one in the ordinary. She knows she has to follow them quickly to prevent death from occurring. Until she finds that the final note makes her think otherwise, she is too late.