When an anti-tech falls victim to an unknown toxin, his son enlists the help of Sherlock Holmes while learning to see Watson as more than a machine.
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* CharacterDevelopment: John starts out very much wanting Watson away and demanding him not to come, only for Sherlock to refuse to come if Watson cannot join. Watson's continued kind attitude despite the hostility causes John to lose this mindset and regard him as a friend.
* FantasticRacism: Watson finds himself on the receiving end of anti-tech views of John Openshaw and his uncle Elias, the latter more than the former. John learns to overcome his anti-tech views because of Watson helping them.
* FiveSecondForeshadowing: Lestrade is quick to point out how hypocritical it is for anti-techs to fire inhibitor beams at them. One commercial break later, it's reveal to not be an anti-tech who is after them.
* {{Foreshadowing}}: Lestrade states that it was a good thing the cybernest wasn't unleashed as New Scotland Yard's computer database uses a similar operating system as the robots. This hints that whoever is after the cybernest wants something other than wiping out robots.
* FrameUp: Implied to be part of Moriarty's latest scheme. His real interest was to use the cybernest to wipe out the Yard's computers, which includes the recent addition of his DNA. Letting people think it was the work of the anti-techs would have made people come looking for the wrong culprits.
* {{Hypocrite}}: Watson notes the irony of Joseph Openshaw, an anti-tech, accepting an artificial heart to save his own life.
* NoSympathy: This attitude towards his brother is what causes Watson to wrongly suspect Elias as the culprit.
* WellIntentionedExtremist: The Tech Saboteurs shunned technology and saw robots and unnatural, having developed the cybernest as a means of wiping them out due to growing fears humanity losing their freedom to machines. Joseph, however, left the Saboteurs after likely realizing the cybernest would do more harm than good.