Tanner decides to use a crowdsourcing platform to try and solve a murder case, as a user provides vital information that could lead to the killer.

Sophe investigates a string of deaths and a serial killer in Silicon Valley and the Bay Area. The program finds patterns and links between previously unrelated murders.

The San Francisco PD goes to Tanner to get Sophie's help on a murder case that may have been politically charged.

The organisation is accused of having stolen copyrighted codes by Tanner's previous company, and face potential closure. Cavanaugh is forbidden from assisting in the murder investigation of a retired detective.

The team investigate a lethal online challenge targeting vulnerable young adults. The connection between Alex and Tanner's prior company is revealed to hold potential personal and political implications.