DARK ANGEL by John Sandford

Letty Davenport, the tough-as-nails adopted daughter of Lucas Davenport, takes on an undercover assignment that brings her across the country and into the crosshairs of a dangerous group of hackers.

Letty Davenport’s days working a desk job at are behind her. Her previous actions at a gunfight in Texas—and her incredible skills with firearms—draw the attention of several branches of the US government, and make her a perfect fit for even more dangerous work. The Department of Homeland Security and the NSA have tasked her with infiltrating a hacker group, known only as Ordinary People, that is intent on wreaking havoc. Letty and her reluctant partner from the NSA pose as free-spirited programmers for hire and embark on a cross country road trip to the group’s California headquarters.