True Blue by David Baldacci

As former D.C cop Mace Perry investigates a mysterious high-profile homicide in a last-ditch attempt to get her badge back, she finds herself on a collision course with the dark side of national security in this New York Times bestseller.

Mason “Mace” Perry was a firebrand cop on the D.C. police force until she was kidnapped and framed for a crime — and then spent two years in prison. Now she’s back on the outside and focused on one mission: to be a cop once more.