It is a breathtaking defence. The architect of this barrier did not attempt to harden the mind against inquiry, did not build some brittle wall to keep the Witness out, but accepted the stricture of intrusion and created a defence in depth—not a shield, but a drowning. It is not accidental, not some caprice of bad drug reactions or paradoxical psychology. It was done, either to the woman or by her, with this end in view: that when—not if, when—the Witness touched her mind, Diana Hunter would confound it.