The first novel begins in San Diego : twelve years old Sophie Foster is quite a surprising character. She has skipped several grades and does not really connect with others, or the world she lives in.

In the blink of an eye, and at the very beginning of the book, Sophie’s life is going to change...

https://shannonmessenger.com/keeper-of-lost-cities.html

These books are awesome and I am so sorry I cannot tell you more about them ! But you’ll definitely love them !