During a boarding to arrest 2 bank robbers, Dutchy is shot by a masked female accomplice and Kate kills her in self defense.
Later that night, 2Dads is drugged and has his uniform and ID stolen, which is used by a mystery man to access the Navy Base and attack Kate, though he escapes from Dutchy and Mike.
The Hammersley crew boards an FFV, and finds four people murdered and a few terrified survivors, one of whom screams that they were attacked by the Australian navy.
Back at NAVCOM, Maxine White tells Mike and Kate that the evidence indicates that the FFV was attacked by the "Sassy," a boat owned by GD Security, a mercenary group run by a former SAS agent, Garth Davidson.
Boarding Sassy, the Hammersley crew discovers a large number of weapons and a foreign diplomat, Mr Tagobe.
Ryan is insolent and dismissive when informed of Stewart White’s death, his own AWOL status, and that his upcoming mission with GD Security could cost him his life.
Hammersley is ordered to escort Sassy, with Minister Tagobe and the diamonds he is carrying, back to international waters, and return the weapons.
A very happy Maxine tells Mike that Davidson was desperate to disappear because a video showing him ordering the massacre of Iraqi civilians has appeared on the internet.
The Hammersley intercepts a fishing trawler which puts up heavy resistance; when boarded a quantity of Semtex is found leading to conclusion that terrorists are building “dirty” bombs for use on Australian soil.
The Hammersley intercepts a cruiser heading for Cairns harbor and a fully assembled dirty bomb is found.
Jim volunteers to try to disarm the bomb; Swain to pilot the cruiser to open water and the rest of the crew returns to the Hammersley.
In a moment of truth before a posthumous award ceremony for Jim and Swain, Kate tells Mike she went shopping for a wedding dress but realized that there was only one man she could marry.