A user of Sophe, the cutting-edge crowdsourcing platform, uploads new footage of Jeffrey Tanner's daughter, Mia, being strong-armed by an unknown man five months prior to her murder. Also, Tanner enlists Sophe to help with Cavanaugh's case of a missing teenager.

The San Francisco P.D. comes to Tanner to get Sophe's help on a politically charged murder case following a rally in the city.