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.

Jack fights to save the life of an undercover cop, Alex St Clare whom he suspects is emotionally involved with her target.

The series resumes on a spectacular note with a helicopter crashing into an overcrowded pleasure boat. The fatality list is long but two survivors are trapped on the sinking craft unable to be moved. Meanwhile, on shore, Mary Coustas (without the Effie frightwig) is a troubled survivor and knows more than she is saying. There is a scramble for clues as the detectives Jack Christey and Alex St Clare track down the cause of the chopper's crash and ponder why the pilot has a bullet wound in his neck. It's a good yarn and the drama, as Tommy Tavita and his mates work to save the trapped souls, is tense.

A torched yacht, two bodies, two men missing. Who is dead, who is alive and who did it?

Christey's gun is stolen from his house. An ex-con is found, shot dead by a police revolver and Christey is set up as the prime suspect for murder.

A power struggle within Charlie Driscoll's crime empire makes Christey a marked man.

Alex's belief in the innocence of a serial arsonist leads her close to a fiery death.

A former lover of Alex's becomes a suspect in a murder investigation and, after Helen Blakemore is forced to fire during an armed robbery, she finds her career on the line as Internal Affairs investigate.

Alex deals with the consequences of sleeping with Matthew Grierson, as the protest against the Marina development continues. Blakemore's career is in jeopardy when she is investigated by Internal Affairs.

The detectives are devastated when their scepticism about a woman's paranoid claims lead to a tragic killing.

ASIO enlists a couple of the Water Rats in a covert operation which causes Reilly to become the victim of an amorous spy and Sykes' love life gets him into very hot.

Jack and Alex are lead round the mulberry bush by a smart alec killer while the ASIO operation comes back to haunt Sykes and Reilly.

Detectives St Clare and Reilly investigate the murder of a restaurateur where their only witness is a ferocious dog.

Alex and Mick must stift through a maze of suspects and motives to solve the murder of Cosimo Luvece.

Christey feels responsible when a grieving woman, who's brother was killed in an armed robbery, takes the law into her own hands and holds him and a suspect hostage.

Quinn and the Water Police are devastated when a young woman dies at the station; and, the detectives search for a kidnapped six year old girl.

Reilly's life is on the line when he backs a street kid suspected of murder.

While recovering from a gunshot wound, Reilly finds his missing wheelchair occupied by a mummified body.

Quinn's attraction to a young woman lands him in hot water during a murder investigation.

Alex personal life throws her off balance leaving Christey and Reilly to solve the brutal slaying of a security guard.

What appears to be a simple mugging of a homeless woman, leads the Water Police into a confusing murder case and a threat on Alex's life.

Alex undercover partner, and ex-lover comes back into her life after a series of death threats and she must take a hard look at the people she trusts.

A murder investigation leads Alex, Christey and Reilly to explore on-line relationships; and, Sykes dreams of becoming a detective.

A drug importing deal goes horribly wrong when a small time crim tries to implicate a notorious crime identity; and, a young woman appears claiming to be Christey's daughter.

A drug importing deal goes horribly wrong when a small time crim tries to implicate a notorious crime identity; and, a young woman appears claiming to be Christey's daughter.

Hawker becomes an unwitting accomplice to murder when he tries to help a friend; and, a young street kid becomes the prime suspect when his pregnant girlfriend is found murdered.

Two halves of a body don't add up for Reilly and Alex. Hawker discovers the reasons behind the murder of Annie's father.

The Rats are caught off guard when they're ambushed on the harbor while transporting a wise-cracking prison inmate. When the getaway plans of the escapee and his girlfriend unravel, they take Christey and his daughter hostage.

Distraught father and hard-nosed detective battle for supremacy when Jack Christey tracks his daughter after she's taken hostage by a prisoner on the run.

When constable Matthew Quinn takes the law into his own hands, he ends up in trouble with his girlfriend, local cops and Hawker; and, Christey, Alex and Reilly face quandry when they track a young woman on the run.

When a retiring cop is bashed and tied naked to a wharf, Christey sets out on a mission to recover his dignity. Further investigations reveals the police officer's attacker is picking his victims from the local newspaper; and Reilly asks Alex out on a date.

When a young man is shot dead in a boatshed, Christey's overzealous actions causes the boatshed floor to collapse sending the body and any evidence into the harbor. When an ex-lover re-enters Reilly's life asking for his help. Christey accuses Alex of being jealous.

When a known drug-dealer is murdered, a member of an anti-drug group is suspected. However, when Reilly's ex-lover confess to the murder his faith is tested.

Alex confronts her prejudices when she thinks they have uncovered a ritual killing by a religious cult.

Jack is haunted by memories on the anniversary of Rachel's death. Coincidence forces him to hunt the woman many still hold responsible for Rachel's murder.

Wheelchair bound Charlie Driscoll makes her last great dash for freedom and Jack Christey is determined to stop her.

Convinced that a car accident was an attempt on her life, Alex investigates, only to discover a larger more frightening truth. Reilly and Christey come to blows over Alex.

Haunted by the brutal murder of a teenage girl, Alex puts her life on the line to identify the murderer; and Reilly wants to know where he stands with Alex.

A water police operation on a container wharf results in a death, leaving each of the Rats to deal with their culpability and guilt.

Christey's investigation into a series of yacht explosions takes him north to a beachside community, where he meets a beautiful female cop with an agenda of her own.

Jack Christey's new relationship is tested when one of the Rats is taken by a serial killer.

Though the serial killer has been caught, Christey supports Blakemore's claims that there is another killer out there, a shadow man targeting the police.

A runaway yacht, a missing child and suspected multiple murders set Alex and Christey down the wrong path, where they uncover a plot to poison Sydney Harbour.

Christey is reacquainted with his estranged father and discovers he is involved in a dangerous scam.

Quinn is forced to re-evaluate the meaning of friendship when he alienates his workmates, as he defends a friend's lies and criminal behavior.

Knowing that a great job is coming her way, Blakemore resigns prematurely and takes the opportunity to tell everyone exactly what she thinks of them.

Reilly crosses the line and unknowingly sparks a murder when he helps his sister's husband avoid jail.

Reilly is forced to cover up the murder of a criminal to save his family.

Hawker remains the professional police officer, even when he is targeted by a criminal. But when the vendetta involves his son, Hawker shows his true colours.

Donna is taken hostage by a convicted killer. Alone, she is forced to rely on her wits and her training to save her life.

The Rats attend a wake. As the alcohol flows, so do the stories and, one by one, their true feelings are revealed.

Christey's daughter is given a brutal introduction to the realities of police work, while the death of a girl in a hit-and-run jet-ski accident causes disturbing memories to resurface for Alex.

Alex's life is a nightmare as she battles an obsessed admirer, her mother and the flu.

On the eve of Gary Sykes' wedding, the rest of the Rats admit to their true feelings - one is dumped, one is given an ultimatum and one is kissed.

Alex and Mick race against time when someone is distributing guns that are rigged to explode when fired.

Things backfire for an old friend of Alex's, when he begs her to find his missing son-in-law.

After a shooting on a Harbour wharf, the Rats discover a love triangle of Russian immigrants and a Cold War in sunny Sydney.

A young troubled boy places a wedge between Jack and his daughter, Sophie.

Alex and Mick try to solve an old burglary and murder whilst battling a retired cop seeking redemption for years of humiliation.

Alex and Mick chase a triple killer through the streets of Sydney.

Alex and Mick investigate the case of a four year old boy found at the bottom of the harbor.

The new boy at the Water Police, Gorgeous George Newhouse is making waves with the women, but Christey is not impressed.

Trying to prevent a full-scale turf war comes at a heavy price for the Rats.

In retaliation for two Rats, Jack Christey sets the cat amongst the pigeons with even more devastating results.