As gritty and unpredictable as the New York City streets that Officer Steven Mayfield patrols, here is a candid account of a cop's daily shift-or beat-and the diverse people and situations he encounters. From a tense standoff with an angry crowd to the monotony of patrolling to citywide emergencies like the attack on the World Trade Center, the challenges change daily. Officer Mayfield faces them with grit and sometimes humor, showing a battered but...