Joe DeMarco likes to call himself a troubleshooter. It sounds better than "bagman" or "fixer." With more than a decade of troubleshooting under his belt on behalf of John Mahoney, the Speaker of the House, DeMarco has seen his fair share of dangerous situations. When Andie Moore, a 23-year-old working in the DOJ's Inspector General's Office, is murdered in cold blood in Florida's Everglades, it falls on DeMarco to get to the...