TR is called to a domestic siege on the outskirts of Melbourne where they journey into dense bush to save a young boy. They soon realise however, that the boy doesn't need saving.
When Josh is shot, Lawson faces a dilemma in how to get the boy under control. Kerry receives the brief for the coronial inquest of causing a cyclist's passing.
Rush follows the lives of members of the prestigious Tactical Response team (TR), which is based on the real life Victoria Police Critical Incident Response Team, a highly mobile unit that fills the operational gap between general duties police and the SWAT-like Special Operations Group. The team is seen responding to unhappy incidents such as carjackings, sleepings and armed offences. Rush focuses on the TR officers, their intelligence officers, Leon, Audrey and Inspector Kerry Vincent, head of the TR administration. It explores both the working and personal lives of the team.