Dark highway
(Book)

Private investigator Jessica Shaw and her partner Matt Connor discover a link between a series of kidnapped women, all taken from along the same highway, and a group of former college friends. But no sooner do they follow this up than one of the kidnapped women's parents gets spooked and drops the case. Jessica is blindsided, but she's determined not to give up: three women are missing, and many more may be at risk. Jessica can't turn her back on them.