The Book of Cold Cases by Simone St. James

In 1977, Claire Lake, Oregon, was shaken by the Lady Killer Murders: Two men, seemingly randomly, were murdered with the same gun, with strange notes left behind. Beth Greer was the perfect suspect - a rich, eccentric twenty-three-year-old woman, seen fleeing one of the crime scenes. But she was acquitted, and she retreated to the isolation of her mansion.

Oregon, 2017. Shea Collins is a receptionist, but by night, she runs a true-crime website, the Book of Cold Cases - a passion fueled by the attempted abduction she escaped as a child. When she meets Beth by chance, Shea asks her for an interview. To Shea’s surprise, Beth says yes.