An anonymous caller offers to lift an ABI 'catch or kill' order on a syndicate enforcer in return for a deadly favour: Kill an ABI leader. Britt Thomas is demoted, relocated and struggling to adapt. Her chief wants a 'new ABI, ' but when an inquiry threatens the bureau's existence, the 'old ABI' searches for answers. Britt partners with a fellow agent in a deadly syndicate takedown. The syndicate retaliate, sending them on a wild rescue mission. From Melbourne's 'Little Italy' to the Victorian high-country, 'Goanna' delivers action and a surprising self-discovery for Britt.