2022 bk 132.Another Ring of Fire series. The author attempts to blend history, chemistry, industrial mechanics, and romance together - and to a certain extent succeeds. I struggled with the long passages of explanation of higher math, industrial settings, and chemical experiments, things I know thrill the heart of the author. As a person more interested in the characters, well, there were times when it was hard to tell the forest from the trees. Before a character was firmly fixed in my mind the author would whisk us away to another scenario. Okay for a one time read and for some of the background into the need for the industrial / chemical engineering. I do hope to meet some of the characters again, especially if they become more firmly formed.