Emily takes a reluctant Gerry and the team to a comedy club to celebrate Gerry's birthday, as the crime drama continues. They're there, mind their own business, when a controversial act comes under fire from a group of hecklers. Sandra discovers the most vocal member of the gang is the niece of a political activist who went missing 25 years previously after waging a campaign against the comedian. Agreeing to reinvestigate the disappearance, the squad discovers that the activist and her boyfriend had infiltrated an extreme right-wing group with links to the dangerous criminal who murdered Jack's wife. Guest starring Phil Daniels, Joe 'remember me from EastEnders?' Absolom and John Henshaw.