Shades of Mercy - Bruce Borgos - Bog

"Porter Beck is the sheriff in the high desert of Nevada, doing the same lawman's job his father once did now that he's returned home after decades away. ... [His] twelve-person department [covers] a large area that is usually very quiet, but not of late. One childhood friend is the latest to succumb to a new wave of particularly strong illegal opioids, another childhood friend--now an enormously successful rancher--is targeted by a military drone, hacked and commandeered by an unknown source. The hacker is apparently local--local enough to call out Beck by name--and that means they are Beck's problem. Beck's investigation leads him to Mercy Vaughn, the one known hacker in the area. The problem is that she's a teenager, locked up with no computer access at the secure juvenile detention center"--