The exploits of a group of men and women who serve the City of New York as police officers, firemen, and paramedics, all working the same fictional 55th precinct during the 3pm to 11pm shift - the 'Third Watch'.

Lena Katz, who is German, and David Fish, who is American, are Jews who live in New York. When Lena's mother, who arrives from Germany, meets her at a hotel, she finds an almost-dead woman lying on the hotel floor. She accompanies the injured woman to the hospital and meets David, who is the woman's son. After David's mother dies from the injuries, a question remains: was she murdered? The trail leads to Germany. Apparently, Lena's mother has some kind of relationship with David's mother that reaches back into the dark German history of the 1940s

After Carol accidentally chops off Glenn's finger in the kitchen, she decides that she is not giving it back to him until he confesses all his affairs.