Bit late to the party, but either Mortal Engines, the Young James Bond series, or Michelle Paver’s Chroncal’s of Ancient Darkness. They were all very engaging and transformative to a young me.

I probably remember parts of Young James bond the best, there’s parts about leeches that really stuck with me. I can still remember Mortal Engines as a whole in great detail, the concept and descriptions of the city chases are fantastic.