Nick wants some downtime so that he can focus on making a forensic profile of the Taliban bomber, but his team are constantly bugging him. He is over the moon to discover a disused roof terrace. but soon sombody else is also wanting to use the space. Towerblock comes up with a plan to scare Bird with Rocket's new pet rat.
After a blast from Nick’s past shows up, it throws him off his game which sees also has a dangerous effect on the rest of the team.