A bomb disposal officer loses a leg in a blast and retires from the police. Three years later, he's accused of involvement in bombings and has no memory of his past or identity due to PTSD. He sets out to clear his name and prevent further attacks, becoming a key figure in the battle between the police and a terrorist organization threatening Hong Kong landmarks.

Shock Wave 2
A ruthless terrorist, skilled in explosives, seeks revenge against the authorities who dismantled his organization. He takes hundreds of hostages in a Hong Kong tunnel, vowing to destroy it unless his demands are fulfilled.