When his best mate and partner is killed in a random attack, Detective Gary Hyde and his new partner Claire McKenzie discover an underbelly of murder and fraud that threatens national security.

Gary and Claire travel to Hong Kong in the hunt for Nick's killer, and uncover a terrorist network operating inside Australia.

Gary and Claire are caught in the crossfire when an outspoken radio host is shot by an extremist. Sonya defends the rights of her star pupil, who is a terrorism suspect in Gary's investigation.