The death of a man with AIDS appears to be the work of a serial killer who may have been motivated by mercy.

Greevey and Logan have a hunch that robbery is a cover for the real motive in the death of a millionaire in a parking garage.

Cragen comes under suspicion when his mentor in the department is investigated for laundering drug money.

The discovery of a young woman's body in the river leads to an investigation of illegal sweatshops and the enslavement of young immigrants.