There's a blue light flashing this Christmas as the Scottish police force spread goodwill and bang-up bad Santas. Volunteer officer Ken Beattie attends to an old acquaintance up an alley, McLaren and Fletcher tame some wild party animals, and Singh and McKirdy bag the first arrest of the new year. Plus the Chief opens up his Radgevent calendar then celebrates every celebration celebrated in Scotland. And officer Karen keeps cool when Bobby gets burnt by dodgy aftershave.

All access to all departments - flashing the spotlight on the good guys banging up the baddies. Knights of the road Singh and McKirdy turn firefighters to extinguish a dangerous inferno and sample some delicious sausages. City cops McLaren and Fletcher rush to the open grass in pursuit of a miscreant on a roll inside a giant hamster ball. The Chief furthers his dream of becoming a best-selling tartan noir crime writer as he rubs shoulders with one of Scotland's greatest novelists. And local man Bobby does what he believes to be the right thing when he hands in a bag of dangerous-looking weapons to officer Karen.