S4E1 - Fair Cop
The Water Police are plagued by a series of hoaxes and it is up to Frank and Goldie to determine who and what they can trust.
S4E2 - A Woman of Substance
When a man is nailed to a tree by his neighbour, Holloway and Goldie discover his wife has vanished.
S4E3 - Double Blind
When a homeless kid is trapped in a pylon in the harbour, the Water Police are horrified to discover a dead body floating in the water beside him. While Blakemore makes it her responsibility to ensure the homeless boy is taken care of, she begins to develop a relationship with the boy's lawyer, Gillian Swain. Meanwhile the Detectives unravel the mystery of the body found the pylon.
S4E4 - Cut off Point
When a gender-specific piece of anatomy is washed up on the beach, Holloway and Goldie investigate.
S4E5 - In the Family Way
Helen's romance hots up. Meanwhile, crime, punishment, betrayal, retribution, suicide and family tragedy when Goldie and Holloway infiltrate a crime family operating an insurance scam on Sydney Harbour. When it all goes terribly wrong, the family is eventually torn apart - not so much by the police intervening, but by in-fighting, backstabbing and betrayal.
S4E6 - Santiago: Rain 27
A crooked grandmother, a fraudulent stockbroker and a water taxi driver who gets taken for a ride, all baffle the detectives. Meanwhile Blakemore's romance comes to an abrupt end.
S4E7 - End Game
Holloway and Goldie's partnership is shaken when a third detective, Michael Reilly, is assigned to the Water Police.
S4E8 - Tomorrow Never Comes
The death of a friend and a forgotten dream prompt Frank Holloway to farewell the Rats.
S4E9 - Goes with the Territory
The working relationship between Jack Christey and Goldie gets off to a rocky start. Already compromised by their past affair, further strain is added when Jack insists on taking the lead in a murder case involving an old acquaintance.
S4E10 - Fish out of Water
Police constable Tayler Johnson becomes romantically involved with a cop on a diving course, but while out on a dive, he goes missing and Tayler realises how little she knows about him.
S4E11 - Good Times and Adventures
Michael Reilly and Goldie have to go undercover at a well-known swingers' haunt to coax a confession out of some murderers.
S4E12 - Blood Relations
Detective Michael Reilly's friendship with madam Susie Abromovich results in them both being taken hostage by an armed robber.
S4E13 - Dial C for Cop
Gavin Sykes is taken hostage by a young man with a desire to be a cop for a day.
S4E14 - Quad Squad
The investigation into the suicide of a young man reveals a greater tragedy, a secret that will ultimately destroy the lives of all those involved.
S4E15 - Unauthorised Entry
Jack Christey and Rachel Goldstein race to save two young girls whose lives are at stake when they inadvertently become caught up in a drug smuggling ring.
S4E16 - Mother Love
A grisly case hits home when Jeff Hawker's wife, Gail, becomes the target of a vicious serial rapist and killer.
S4E17 - I'm Home
Goldie faces every mother's worst nightmare when her son David becomes the victim of a brutal and vicious kidnapper.
S4E18 - The Drill
A burning body is found floating on a sail board in the harbour; Jack Christey recognises the work of a killer who is still in jail; did Christey convict the wrong man?
S4E19 - Green Light
A spate of armed hold-ups have Goldie and Jack chasing a robber dressed like a cowboy from the wild west.
S4E20 - Red Light
Our two Aussie heroes, Rachel Goldstein and Jack Christey, investigate the theft of valuable art work from a harbourside property owned by a once famous madam, Sadie the Scissors.
S4E21 - Can't Buy Me Love
While investigating the murder of a thief an his missing haul of black opals, Goldie and Christey stumble upon an unexpected love triangle.
S4E22 - Free as a Bird
When a young boy's dead body is found, Goldie and Jack have to prove who is responsible before an enraged local community exacts their own just on the main suspect.
S4E23 - Dangerous Encounters
Goldie and Jack are kidnapped and hunted like animals by a murderer who sees his victims as prey.
S4E24 - Force of Habit
Investigating the murder of a wealthy businessman and the apparent kidnap of his second wife, Jeff Hawker is reacquainted with a woman he once loved but lost to another man.
S4E25 - Shark Bait
When a man is taken by a shark in the harbour, the water police uncover a complex web of embezzlement, a faked death, underworld connections and a bizarre betrayal.
S4E26 - A Day at the Office
What starts as another ordinary day at the office ends in the death of a Goldie a much loved rat.
S4E27 - Kaddish
The surviving Rats swear revenge for their fallen comrade!
S4E28 - For Love or Money
Jack believes he has discovered the identity of Goldie's killer, but his only clue may just slip through his fingers.
S4E29 - Helter Skelter
Jack hands in his badge and turns vigilante in order to find Goldie's killer.
S4E30 - Friend or Foe
Friendships are tested when Mick Reilly's best mate becomes embroiled in a murder investigation.
S4E31 - Mr. Medium
Jack is forced into a deal with undercover cops when Detective Alex St Clare joins the rats and there is a conflict of interest in a murder investigation.
S4E32 - New Kid on the Block
Jack fights to save the life of an undercover cop, Alex St Clare whom he suspects is emotionally involved with her target.