They never learn
(Book)

"Scarlett Clark is an exceptional English professor. But she’s even better at getting away with murder. Every year, she searches for the worst man at Gorman University and plots his well-deserved demise. Thanks to her meticulous planning, she’s avoided drawing attention to herself - but as she’s preparing for her biggest kill yet, the school starts probing into the growing body count on campus. Determined to keep her enemies close, Scarlett insinuates herself into the investigation and charms the woman in charge, Dr. Mina Pierce. Everything’s going according to her master plan…until she loses control with her latest victim, putting her secret life at risk of exposure."--Publisher description.