Al's mentor, a career homicide detective, is gunned down outside an NYPD social event. Emotions run high when the murder investigation uncovers that the older cop may have been corrupt. Carrie's memory helps break the case, but she may hesitate to tell Al everything she remembers -- when her memories seem to damn Al's mentor. Al's feelings for this older cop are colored by his complex relationship with his own father. So the Carrie/Al/Elaine triangle is further complicated, when Carrie, having known Al's father, and a cop herself, becomes his more natural emotional confidante. This episode explores family themes -- especially the notion that cops are a family, albeit a dysfunctional one.