Story about magical book where two characters are in two different time periods and come across this same book, YA fantasy

[Kaitlyn]

this book was YA, fantasy, and slightly historical fiction? the plot surrounds a magical book that connects two different characters, a girl and boy. However, one character is set in the past while the other is in the future. This is really all i truly remember, but i vaguely remember the two main characters being able to communicate with one another through this book

[Kaitlyn]

I read this book during 2013-2014

[Rosa]

There's something like this in Physik.