Explosives Officer Lana Washington and her team are called to investigate a suspected bomb threat – an iconic, London Black cab that's been abandoned in a wasteland. However, they soon realise they're at the site of something far more sinister. Working alongside her colleagues in Counter Terrorism Command, the team race to find out what the person behind this unique bombing campaign wants, who they are, and who they might be targeting next…

With the help of Lana, Counter Terrorism Command learn more about the recent murders. But their progress doesn't go unnoticed by the bomber, whose campaign only intensifies, putting more people in grave danger.