A university student who has committed suicide is revealed to be the victim of bullying, and concern grows when a gun is discovered in his locker and a memory card in his stomach is found to contain photographs of his tormentors. The team's fears become a reality when a building comes under attack by a rampaging shooter, leaving Harry and Nikki trapped inside. All Leo can do is watch helplessly via CCTV security cameras as his colleagues try to help the wounded. Specialist firearms officers storm the building and find suspected shooter Scott Weston, lying on the floor... The concluding part of this episode can be seen tomorrow.