Every Inch of the Way - Heidi Belleau, Amelia C. Gormley
These characters seem more developed than they have in previous stories. After reading Every Inch of the Way, I feel like I know all the players better. I understand their motivations, to a certain extent.

See the entire review at The Novel Approach: http://thenovelapproachreviews.com/2014/03/10/the-professors-rule-series-by-heidi-belleau-and-amelia-c-gormley/