In any case, Olivia had been supplied with detailed instructions as to how to shut down her little safe house, should it come to that. There were no papers to shred, no tapes to burn. Everything was electronic. So the shutdown procedure came down to frying the electronics. This they had made easy. Everything in the place had a kill switch; all she had to do was hit that, and a jolt of high voltage would go through all the chips and destroy the information stored in them. The PSB could still recover the circuit boards, but, according to Alastair, these were devoid of useful information; they were just stock chips, off-the-shelf stuff that anyone could buy from electronics retailers on the Internet, connected together in an obvious way. The important stuff—the unique stuff—was all in how they were configured, the bits that they contained, and this was easy to scramble. It would be nice, he stressed, if she could prevent the stuff from falling into their hands—for example, by throwing it over the railing of a ferry or burning down the building (she couldn’t tell whether he was being serious about this last suggestion)—but the most important thing was to hit all those kill switches.