When HMAS Hammersley answers a distress call from Bright Island, Captain Mike Flynn and his crew discover a young woman lying paralysed on the beach.

The Hammersley uncovers a sophisticated drug smuggling network with explosive results. Mike is convinced the federal police are covering up the poisoning death of a marine biologist.

The crew uncovers a murder mystery after finding an abandoned catamaran on the high seas. Nikki's navigation skills are tested when Mike insists on doing a search and rescue for a missing sailor.

Mike is torn between saving the life of a missing refugee girl and the lives of two shipmates bitten by the deadly Irukandji jellyfish.

The HMAS Hammersley attempts the daring capture of an illegal fishing mothership, but they are thwarted by violent eco-terrorists intent on sinking the fishing boat.

The crew uncovers a people-smuggling racket when they almost collide with a floating shipping container full of North Korean refugees.