“For months the previous year she had monitored message boards for suggestions of terrorist activity, and while she'd never entirely thrown off the suspicion that every other poster she encountered was an undercover cop, she'd grown used to eavesdropping on tin-hat conversations, from how the government was controlling the weather to the thought-experiments carried out on anyone who rang HMRC helplines. And all of these philosophers, without exception, were convinced they were under surveillance, their every online foray or mobile chat recorded and stored for future use. That this was probably true was an irrelevance, of course; they were simply caught in the same net as everyone else. Louisa had never trapped a terrorist; never stopped a bomb. She'd read it lot of discussions about 9/11, obviously, but contributions from structural engineers had been conspicuous by their absence. And while the helpline thing wag probably true, that was just the law of averages at work.”