Police dogs Meg and Thor finally reunite with their handler Martin after he broke his leg. Together, they set out to track a mysterious BMW with suspected links to drug dealing.

Rookie Alsatian Kane and handler, PC Harris, have a busy night shift going after a burglar targeting the elderly; new handler Nikki investigates a bomb scare with explosives detection dog Oscar.

Chico finds a huge stash of cannabis, disrupting a major drug operation in Liverpool. Lucy the Labrador unearths a hidden stash of cocaine in a car after human officers fail to find anything.

Thor the German Shepherd joins a firearms unit and helps storm a derelict building, while sniffer dog Meg raids an apartment with possible links to drug dealing.

Fletcher's dog Patto has been injured during the pursuit of a criminal. Meanwhile, Harris and his dog Kane set out to track down the driver of a stolen car.

Office Bartley reminisces about his first police dog, Ghost, who was killed while chasing a gang of burglars. Meanwhile, sniffer dog Lucy is called into action when a suspicious driver is stopped.