Deliver Us (2015) by Kathryn Casey

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When she isn't playing detective or wasting our time with interviews of decidedly unhelpful criminals -- including an entire chapter dedicated to the absurd ramblings of a thoroughgoing nutjob -- Kathryn Casey tells an involving story of many of the more than 20 young women who, from 1970-2000, were murdered and dumped along the I-45 corridor that runs between Houston and Galveston, Texas.  Not a lot of answers here (the vast majority of the cases remain unsolved), but with so many victims, Casey never lacks for a new mystery to recount.  With a strong secondary focus on the families of the victims -- if you like that sort of thing.