Six Days - Patrick J O'Brian - Bog

Police sergeant Tim Packard is a man known for getting things done. When a new police chief is appointed, Packard heads up a new task force designed to cut down recent drug trafficking in a Central Indiana city.
The attention of his new task force is quickly diverted, however, when a group of terrorists invades his city. Wreaking havoc, the terrorists set out to randomly murder citizens, poison the water supply, and blow up key buildings.
When Packard discovers one of the terrorists might have a link to one of his officers, things only grow worse. Forced to decide where to place his loyalty, and whom to trust, the sergeant realizes the fate of his city rests almost entirely on his shoulders.
Not a man who plays by the rules, Packard puts the safety of others and his reputation ahead of everything else. He and his men do whatever it takes to bring criminals to justice, and decide to use their own brand of justice against the terrorists.
Outgunned, outnumbered, and seemingly one step behind the terrorists at all times, the task force members use their knowledge of their city, investigative experience, and a few dirty tricks to track their new enemies.
Unsure of whom to trust, Packard ultimately withdraws himself from a group of emergency personnel formed to stop the terrorists, much to the dismay of his superiors. Deciding to place complete trust in his own group, and his knack for getting jobs done, he risks everything to save the city in which he has lived his entire life.
Should he fail, thousands could die, and if he succeeds, it may be at the cost of his own career.