Talking to Strangers by Fiona Barton

Detective Elise King’s investigation into a woman’s murder is getting derailed by a reporter who insists on doing her own investigation in this nail-biting mystery from the author of Local Gone Missing.

When Karen Simmons is murdered on Valentine’s Day, Detective Elise King wonders if she was killed by a man she met online. Karen was all over the dating apps, leading some townspeople to blame her for her own death, while others band together to protest society’s violence against women. Into the divide comes Kiki Nunn, whose aggressive newsgathering once again antagonizes Elise. 

A single mother of a young daughter, Kiki is struggling to make a living in the diminished news landscape. Getting a scoop in the Simmons murder would do a lot for her career, and she’s willing to go up against not just Elise but the killer himself to do it.