When injured war hero Charlie finally returns to SAS service, he no longer needs Caesar's help as a care dog. Caesar can go back to what he does best ? as a super-sniffing explosive detection dog in the Australian Army. Caesar and his handler, Ben, discover a bomb at the Sydney Opera House, targeted at the visiting Secretary-General of the United Nations. A little later, while on a peace mission in Afghanistan, the Secretary-General's helicopter goes down and he is captured by the Taliban. Caesar, Ben and Charlie join an international team to rescue him.