The tables are turned on Detective Danny Reagan, when drugs are found in the boot of his car and he's taken into custody. It is up to his family to prove his innocence.
Danny and Baez think a girl has been kidnapped, but her mother denies it; Frank visits a priest who was arrested for a DUI.
The team tries to find a bike messenger, who has kept a video diary of his troubles with women, before he can commit another violent act; the new deputy chief calls Benson's leadership into question.
An expert on anthrax is accused of orchestrating a series of anthrax attacks. Bull sets out to prove the city was in such a rush to calm the public's hysteria, they arrested the wrong person.
Justice and the law are at odds when the police find themselves prosecuting a priest accused of murdering a drug dealer.