Sergeant David `Podders" Podmore is called out to investigate after a shooting in the Liverpool area, and following a raid at a property, a number of weapons are seized, including a potential improvised explosive device made out of industrial fireworks. Meanwhile, Sam Jones and Matt Coogan head to the scene of a mortar bomb discovery, while Sergeant Alex `Swansea" Hughes is called to Llandudno, where a magnet fisherman has taken a mortar that he's found to work.