Editing A Philosophical Investigation (section)

==Plot summary==
In a near-future, a British neuroscientist named Professor Burgess Phelan has discovered a portion of the brain, the VMN, that is typically twice the size in men as it is in women.  In certain men, however (approximately 1 in 100,000), it is the same size as a woman's, and that abnormality is an exceptionally accurate indicator of violent sociopathy.  Professor Phelan developed an imaging device called L.O.M.B.R.O.S.O. (Localisation of Modullar Brain Resonations Obliging Social Orthopraxy) used to help diagnose men with the VMN deficiency.

In the interests of public safety, the Lombroso institute is set up to test all the men in Britain.  Males are enticed with ad campaigns to submit for testing; those who are VMN-negative are given confidential treatment, including counselling and drugs, and assigned a code name out of the Penguin book of Great Thinkers (''e.g.'', [[William Shakespeare|Shakespeare]], [[Plato]], etc.).  The police aren't given the names of the VMN-negative, but they are allowed to confirm whether or not a particular person is in the Lombroso Institutes system as VMN-negative.

"[[Ludwig Wittgenstein|Wittgenstein]]" is the code name of a VMN-negative who, until he was made aware of his status, was living a well-adjusted, if solitary, life, venting his sociopathic tendencies harmlessly through [[virtual reality]] entertainment systems.  Upon discovering his [[pathology]], though, he undertakes a public service of his own: after hacking into the Lombroso Institute's systems and obtaining a list of all VMN-negative men in Britain, he undertakes to kill them all.

The narrative unfolds from a dual perspective: Wittgenstein's, and the female police lieutenant, Isadora "Jake" Jakowicz, assigned to catch him.  Wittgenstein's portion is told from the first person as a diary of his assassinations and subsequent downfall; the detective's portion is told in a more traditional third-person perspective.