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.

Sgt David Podmore is called to investigate an explosive substance in his unit's home city of Chester, where police have found an arsenal of weapons, but are unsure of a chemical giving off smoke and have evacuated the area. The highly skilled search team uses hi-tech equipment and specialist dogs to look for weapons and explosive devices at the Birmingham hotel being used by for the Conservative Party Conference.