Night Tides by Alex Prentiss

In the novel Night Tides by Alex Prentiss, a Madison diner owner named Rachel Matre possesses a mystical, intimate connection to lake spirits that grant her psychic visions. When a series of abductions targets local women, Rachel uses her supernatural insights and an anonymous blog to track the predator, eventually becoming a captive herself. Parallel to this mystery, she enters a complex romance with Ethan Walker, an Iraq War veteran struggling with his own psychological trauma. The antagonist is revealed to be Arlin Korbus, a terminally ill tattoo artist who views the victims' bodies as a final canvas for his unwanted art. After a harrowing escape and the killer's death, Rachel must reconcile her permanent scars with her burgeoning feelings for Ethan. Ultimately, the story weaves elements of urban fantasy, suspense, and romance against the backdrop of Wisconsin’s geography.