I picked up Immunity, by Erin Bowman, as soon as I finished the first book in the series, Contagion. The conclusion to this duology offered everything I loved about the first book, plus the addition of a more typical young adult character arc for the main characters.
Contagion, by Erin Bowman, is a 2019 Edgar Award nominee for Best Young Adult Mystery. When it made its way to the top of my To Be Read pile and I read the jacket copy, I was excited to start. I could hardly put it down before I finished.