The long dark tea-time of the soul

Why did the passenger check-in desk at Heathrow Airport suddenly go shooting up through the roof in a magnificent orange ball of flame? Why did Britis Nuclear Fuels say that there was hardly any radioactive leakage at all, and why are the usual people -- the IRA, the PLO -- trying to claim responsibility? Dirk Gently, the holistic detective who always gets reults, tries to seek the answer.