A crime scene investigator is murdered in her apartment. Her fiance is suspected, but then a journalist is attacked and DNA is found at the scene that links this crime to the murder.

A doctor who performs late-term abortions is murdered in church. The case falls apart for Cutter when Rubirosa is touched by an abortion nurse's testimony.

The debate rages over how to treat an informant who shot and killed four police officers. However, did one of the officers try to put undue pressure on him to help catch a dangerous criminal?

Detectives search for an anonymous blogger who has posted plans to blow up a school. Lt. Van Buren struggles to keep her personal issues private.