A young Arab woman is brutally raped and burned, and after identifying her, the detectives suspect her husband and mother-in-law. After a man accused of the murders of three Arabs, he claims that he was genetically and biologically predisposed to hatred and violence, but soon they uncover the real impetus to the slayings.

Detectives try to decipher a motive for the strangulation of a Bronx assistant DA in an area where hookers stroll. When the death of the prosecutor looks staged using information gleaned from a co-worker's caseload, Novak endangers her career to obtain a confession.

The discovery of the bodies of two young gay men who were both meth addicts as well as victims of a new strain of AIDS that can kill its victims in less than a year leads to an investigation. Tutuola learns that his son, Ken, is gay, and has difficulty accepting it, even though he and Benson end up going to Ken for help with infiltrating an anti-meth group. The group's leader, Gabriel, soon becomes their top suspect when the squad realises that the two men died because they passed the disease on.