As a result of the capture of Klenner, Lightfoot hopes to expose his entire network. Whilst police swoop on his operatives in various major cities, the Big Sky pilots are to attempt identification of rural distributors by tracking bugged packages of heroin to their ultimate destinations.

Lightfoot entrusts Big Sky with their most important brief so far: to find a missing plane that was carrying one of Lightfoot's agents, Joy. She was on her way to give Lightfoot some highly valuable, but unspecified photographic evidence. Lightfoot considers the mission too important to entrust to Jimbo, and he is banished to a milk run.

Lightfoot apologises to Chris. If Chris wishes to know the truth about Lightfoot, then he makes the decision to step into the shadows with him and swear to the utmost secrecy. Chris agrees to the deal, then must cancel a date with Grace to fly Lightfoot to meet a senior military figure, Major Ellison and for the first time is included in the top level meeting.

Lightfoot is determined to find the remainder of the guns stolen from the army, as masterminded by Major Ellison. Keeping Ellison under constant surveillance, he is followed to a property owned by well known criminal figure, Mick Kounos. Kounos denies any involvement.

Chris vows to stand by Grace as she faces an internal enquiry regarding her apparent theft of drugs from the customs evidence room. She presents a plausible explanation for her actions to an internal investigations panel, and all seems well... until she receives a call informing her the panel cannot accept her explanation and will turn the matter over to the police.