Chief Commissioner Cameron Miekelson's latest rehabilitation venture sees him join forces with Sir Tom Hunter; sparks fly when PC Jack McLaren and his partner PC Sarah Fletcher offer a helping hand at the scene of a fire, and Acting Sergeant Ken Beattie gets a shock as he solves a murderous cold case.

As part of a drive to rehabilitate ex-cons, The Chief enlists the help of Scots entrepreneur Sir Tom Hunter to offer business support and guidance. However, the Chewing Gum Poster business model gives The Chief a nasty aftertaste and puts him in a sticky situation.

PC Jack meets his match in the shape of fighting-fit Fire Chief Jacqueline McLaren. His help turns into a hindrance when he rushes in to save the day and show off, only to be rescued by Jacqueline - much to Sarah's delight.

Meanwhile, confessions from the afterlife spook, Acting Sergeant Ken Beattie, into solving a cold case from the past; while PC Hugh McKirdy and PC Surjit Singh have their heads turned by a magician at the roadside who tries to pull a disappearing act.