The Square Root of Murder (Professor Sophie Knowles Mystery 1)

While celebrating famous scholars of the past with her students, Dr. Sophie Knowles, a much loved math teacher at Henley College, must add up the clues to prove her assistant's innocence when she is accused of killing Dr. Keith Appleton, the most disliked professor on campus. Math Professor Sophie Knowles shares her teaching venue with many other math and science faculty, most of whom she gets along with. But one in particular gives Sophie and her teaching assistant, Rachel, a hard time, thus annoying both women. When this colleague, a professor of chemistry, is found dead, poisoned in his office, Rachel is the prime suspect. Its up to Sophie to put her talent for designing and solving puzzles to use to find his killer.

Dr. Sophie Knowles teaches math at Henley College in Massachusetts, but when a colleague turns up dead, it's up to her to find the killer before someone else gets subtracted.