Law & Order: Criminal Intent (2001)

Season 2: Episode 7

The detectives investigate a triple murder, including the son and daughter of a wealthy businessman, that occurred in his apartment. After investigating the childrens' stepmother (his second wife), they turn to a pair of nannies, one of whom works for the family. However, the detectives must reach back to the nannies' history as children, and a television soap opera, in order to better understand the motives for the crime.