Twenty-six-year-old Elizabeth Austin has been cured of epilepsy by a new and daring experimental treatment. Tiny electrodes implanted in her brain, control her seizures and restore her to a normal life - free to repair a troubled marriage and resume an abandoned career. But as part of her operation, Elizabeth had agreed to have other electrodes implanted - in the so-called "silent" areas of the brain, whose functions are unknown to modern science. And when one of those electrodes is stimulated, Elizabeth is gripped by strange, shattering sensations. They are not memories - at least, not her memories.