When building superintendent Frank McKinnon is found murdered in the basement of the building he works and lives in, Logan and Briscoe initially investigate the crime as a potential break-in until forensics discovers that the "break-in" was staged. The state's attention soon turns to Sean, Frank's 17-year-old son. Dr. Olivet determines the son is an abusive sociopath after interviewing him. But when the victim's wife claims that Frank beat his family on a regular basis, Stone and Kincaid try to determine who is telling the truth.