The final episode of the series sees the Scot Squad continue their relentless pursuit of misdemeanour, misdeed and malfeasance, finding themselves falling victim to hunger, alcohol and the irresistible laws of attraction. 

When it comes to Mother Nature, Chief Commissioner Cameron Miekelson is a self-proclaimed 'mummy's boy', and as such, he is acutely aware of climate change. In preparation for the potential change in Scotland's weather, he has designed some new uniforms to deal with whatever the climate, and the criminals, can throw at his officers. Come hail, rain or shine, nothing will stop the police shutting down shenanigans. 

Back together as policing partners, PCs MacIntosh and Mackay are called to an illegal drinking den. However, as they bust the boozy bar, it becomes clear that this speakeasy isn't quite what it seems. Meanwhile, detectives Squire and McGill are on a lengthy stakeout, poised to pounce on their perpetrator. However, without sustenance, can these professionals handle the hunger long enough to capture their prey? 

Elsewhere, love is in the air as remote investigators Annie McInnes and Archie Pepper take a little time out from cracking down on cyber criminals to celebrate Valentine's Day. Traffic officer Hugh McKirdy is also feeling amorous, as his colleague PC Surjit Singh helps him present his best policing profile on some dating apps. Can Hugh finally find the woman of his dreams, or will it turn into a nightmare yet again?