The death of an American seaman on a U.S. nuclear submarine during an AUKUS ceremony on Sydney Harbour is investigated in a joint effort between America's NCIS agents afloat and the Australian Federal Police (AFP), on the series premiere
The team investigate the death of a navy compliance officer who has been found in a waterhole with a snakebite from the most venomous snake in the world. The snake, an inland taipan, is uncommon to the area the officer was discovered.
When a US petty officer's body is found in the Sydeny's historic and haunted Rocks area a decades old Navy cross medal holds the clue to solving the murder, leading the team on a world ghost chase to catch a killer.