Trudi Cavanagh had a system. It was the only thing keeping the crumbling Victorian shop at 42 Sycamore Lane from dissolving into pure, unadulterated entropy.
If you are new to her work, the best starting point is "Iron Tracks." Starting with the first Sarah Sidener book allows you to grow with the protagonist and understand the recurring themes of her world. However, if you prefer a quick, self-contained mystery, "The Neighbor’s Secret" is an excellent entry point into her writing style. trudi cavanagh books in order
Her magic systems often involve a physical or social cost; for instance, in Thief's Magic Trudi Cavanagh had a system
Trudi Canavan is best known for her high-fantasy trilogies. Fans generally recommend starting with the Black Magician Trilogy if you prefer a quick