A Philosophical Investigation
Philip Kerr

London, 2013, and the city is battling an epidemic of serial killings - even with the widespread government use of DNA detection, brain-imaging, and the 'punitive coma'.

Detective Isadora 'Jake' Jacowicz is hunting a murderer, code-named 'Wittgenstein,' who has taken it upon himself to eliminate anyone who has tested positive for a tendency towards violent behaviour - even if they've never committed a crime.

His intellectual brilliance is matched only by his homicidal madness.