If You Like Percy Jackson, try Noah Zarc: Mammoth Trouble by D. Robert Pease. It’s a Time Travel Action Adventure Series (and the Physics of Time Travel). Then, go backwards in time along the same story line but with A Wrinkle In Time’s Sandy and Dennys in Many Waters.
I remember reading A Wrinkle in Time about — dating myself — 35 years ago and how much I loved this book and this author. It was as if entire worlds opened up for me; suddenly science was something mysterious and exciting, as it should be, not something to toil over and memorize. Is it because it’s a tale of a classic theme of good versus evil; light against dark? No, there is so much more to this book. Madeleine l’Engle is not just a great storyteller, but a scientist, dreamer and philosopher.