The gruelling investigation of the attacks on the Mt. Thomas police continues, as Tom heads to Melbourne to investigate the man who sold the parts for the bomb. He links it to chemical dealer 'Doc' Parkinson, and is determined to prove that he provided the Baxters with supplies for both the bomb and the speed.

Although Nick seems to be against this idea, he does join PJ and Amy - who everyone at the station is very impressed with - on another search of the Baxter property, during which time he plants listening devices in their home - which ultimately lead them to discover the truth.

On a doorknock, Jonesy and Susie rescue an attractive woman named Donna from a rubbish skip she has been locked in, and Jonesy falls for her. That night at the pub, her former de facto lover hits him, and then claims that Donna took all his possessions, and is a con artist.

Ben has been fawning over Susie a little too much, buying her expensive gifts, and she ultimately gives them back and leaves him unsure

Despite allegations by her ex-boyfriend Theo that she isn't all she appears to be, Jonesy stays firm to Donna in trying to protect her. She soon moves in with him.

Only Susie is suspicious of Donna, a suspicion seemingly confirmed when Jonesy's room is trashed. He arrests Theo, whom Amy recognises from her time in Melbourne - he was involved in an assault on a known drug dealer. Tom agrees with Amy, and refuses to give Donna police protection since she may be involved.

Jonesy is not happy, pleading with the others and ultimately storming out of the station to go and personally protect Donna. The cops begin to consider that they've gone too far, but a defiant Tom stands firm - Jonesy had better come back, or he'll be out of a job...

Jonesy finds his career on the line as he attempts to protect Donna, and so he is stunned when he learns that she is a call girl. When they are attacked by Theo, and Jonesy claims that Donna was abducted, Amy soon doubts his theory - thinking that Donna faked her abduction. Susie soon joins in on this theory, after Donna tells her that she has Jonesy now, and Susie can never have him back.

Although Jonesy is allowed to return to work, and attempts to patch things up with the others, he is still seeing Donna - and is stunned when she tells him that a missing man named Hugo Allen was killed by Theo, and that Theo is actually a hired hitman.

Jonesy is stunned when Donna tells him that the people who hired Theo to kill Hugo Allen were in fact the police of St. David's. As he goes about investigating secretly, he learns that the police have not been caring about Allen's disappearance. When Amy finds out about his investigation, he is forced to get Donna to talk to her.

Donna confesses that Louis Chang, a restaurant owner in St. David's, runs an illegal casino from his restaurant and she was a call girl there. She was with Hugo when he found himself in trouble with Chang, and subsequently Chang had his police buddies order Hugo's death. She had a mobile phone with pictures of the casino on it, but it was stolen when Jonesy's room was ransacked.

Amy believes Donna's story, but decides not to tell Tom in case he, too, is corrupt. Jonesy and Amy go to Chang's posing as a dating couple, but are interrupted by Inspector Falcon-Price and St David's multicultural police liaison Lucy Wu, who are also dining there. Jonesy suspects tha

Donna is once again missing, but this time when she turns up she is high on cocaine, and Amy and Susie are desperate to know where she got it from.

Meanwhile, Chris attempts to get someone to listen to her when she suspects there is a person hiding in her pub, and late one night she and Joss investigate and discover her ex-husband, Terry Kennedy, in the cellar. Kennedy came through decades earlier with his shearing mates and married Chris while she was still the publican's daughter, before eventually running off. She wants him out of town, and Tom agrees.

The rest of the station is busy as usual: the disappearance of a pig and a dog causes an uproar; Ben and Susie - who appear to have begun a sexual relationship - seem to be at odds over where they are going next: Ben clearly wanting to go further, Susie not so sure; and Lucy Wu has been popping up at the station.

An angry Jonesy goes to see Louis Chang but gets nothing out of him, however later the mobile phone with pictures of the il

Jonesy is missing, and the general consensus is that he has run off with Donna. Only Susie is suspicious, and rightly so - since he has been shot and wounded, and finds himself being held captive by Louis Chang.

Tom is at first unwilling to believe Susie, and is too busy with the investigation into police corruption into St. David's.

Frustrated, Susie has no choice but to go undercover unoficially and Ben - of course - agrees to help her.

Tom and the team investigate Inspector Falcon-Price but the evidence soon proves that he isn't guilty, and neither is Lucy Wu - who both Amy and Jonesy were suspicious of.

As the day comes to a climax, Susie and Ben find themselves in a dangerous situation which they survive, but she ultimately breaks up with him. Jonesy has to do the same to Donna, and has her arrested. And Amy is stunned to learn that her friend Andrew Reid is the real corrupt cop at St. David's.