Series 4

Bobby fidgets with something explosive that officer Karen told him to keep his paws off.

The traffic cops tackle a dodgy driver, detectives smash a smuggling operation and the Chief bravely faces up to a blast from his past with Lorraine McIntosh guest starring as his ex-wife.

PCs Singh and McKirdy gallantly help out a hen do transport their obscene inflatable, while Chief Commissioner Miekelson's attempts at international diplomacy involves shouting loudly at a computer during a video conference.

Singh and McKirdy pull over a couple of Scotland's most celebrated children's entertainers.

PC Ken Beattie finds himself duped by the offer of free hugs from a stranger, The Chief is stumped by a new crime-fighting campaign; and countryside coppers, PC Charlie McIntosh and PC Jane MacKay find a spiritual connection in their latest investigation.

PCs Fletcher and McLaren go that extra mile to assist a top TV meteorologist.