It All Adds Up to Murder by Robert Harris

When a man is strangled on the campus of Felton University, librarian Jane Hall believes it may have something to do with a note she came across earlier in the day. It’s just an intriguing possibility until a close friend is injured during a second murder attempt two days later. Then it becomes a personal challenge: the killer must be stopped. But as Jane begins to put the pieces together, it also becomes a personal challenge for the killer, who is only days away from a comfortable retirement: Jane Hall must not interfere.
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Robert Harris is a writer, inventor, and puzzle constructor. His books include 101 Things NOT to Do Before You Die, the best-selling thriller The Möbius Incident, and the Claude Monet, Private Eye mystery series. All are available at amazon.com. Robert can be contacted through his website, artspace5.com.