Intermediate Thermodynamics

While I liked the first book in the series, I didn't connect with the characters all that much.
Imagine my surprise and delight at getting to know somewhat-prickly and assertive Esther, who - at least in some regards - is absolutely my spirit animal (well, at least one of them). I rooted for her from the start, and I especially loved to follow her developing friendship with Jonathan.
Bonus points for bestie Jinny - the girls make a great team, and I had so much fun reading about them!