Hard Town by Adam Plantinga

Ex-cop Kurt Argento is housesitting for an old friend in Braylo, Arizona when a woman named Kristin Reed asks for help in finding her husband, Warren. He went missing in a town named Fenton, which is about 40 miles from Braylo. Kurt declines to help her, but when Kristin and her young son, Ethan, disappear, Argento decides he must get involved, because something very weird is going on in Fenton. In a town of about 1,000 residents, there are eleven men in the town's public safety department. They are not policeman and act more like soldiers. The men also very concerned with watching visitors to the town, like Argento and others who are passing through. In this second book in the Kurt Argento series, Plantinga writes a page turner that is a read-alike for Lee Child and Nick Petrie.