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Jo is convinced by Jonesy to cut a speeding fine after he discovers the perpertrator is an old best friend, Ian Bolger. Meanwhile, Jo is surprised when she sees a man who she suspects is a burglar from years ago and takes him to the station, where he is promptly released. PJ, Tom and Tess won't tell her why, or who the strange visitors at the station are. Tess is angry when she discovers Jonesy let his friend off the hook but that is nothing compared to her anger when Jonesy unknowingly blows a major undercover operation.

It turns out that Jim Deakin, who Jo took to the station, is in fact a diamond thief and is involved in a major heist and the Heelers were assisting Undercover. Jonesy, bringing a tyre to the same mechanic that Deakin was to meet his accomplice at, blew the entire operation and the Heelers discover money for the operation was found inside the tyre. Jonesy knows Bolger asked him to take the tyre but Bolger says it was the other way round. Jonesy is temporarily placed on office duty but then speeds off when he sees Bolger and Deakin together.

He calls Tess and the Undercover detective Maxine Swann but by the time they get there, an informant inside the diamond ring is dead. PJ tells Swann she should have told him about the informant but Swann still blames Jonesy. And when the gun is found in Jonesy's room, everyone is fighting for his innocence.

When Jonesy finally gets the truth from Bolger, he is taken hostage by Deakin and Tess and Jo risk their lives to save him. That night, Tess unwittingly lets out her true feelings for Jonesy before running off... Add a recap »