Jeffrey Tanner is obsessed with finding who murdered his daughter and has developed an online, crowd sourcing app called Sophe to help him. His team is a unique collection of talented individuals with many different skills.
Crime data is entered into Sophe looking for links to Mia. Instead it links 3 previously unrelated cases. When Cavanagh adds a clue it jumps to 14 and keeps climbing with crowd help. Meanwhile Carlos Ochoa is threatened in prison.
Tanner has to deal with cyber attacks when they are asked to help solve the murder of a white supremacist. Tanner and his wife are at odds when private information is leaked to Sophie regarding their deceased daughter.
A medically retired Inspector is murdered. Cavanaugh is not allowed on the case due to his prior involvement with the widow, so he seeks Tanner's help. Meanwhile, Tanner's prior company alleges he stole their code to create Sophe.
A computer expert creates a game that targets short-attention span teenagers and compels them to commit suicide. Meanwhile, a clue emerges in a photo of Tanner's daughter.
Cavanaugh's plans to reconnect with his 14-year-old son are interrupted when the team and the crowd identify a fugitive domestic terrorist on the loose; Tanner and Sara's ongoing legal troubles drive a wedge between them, with Mike trapped in the middle; Alex confronts Tanner about the Congressional investigation; the team loses control of the crowd, with potentially deadly consequences.
Tanner and the team race to halt a digital attack that has silenced the crowd and knocked the platform offline, forcing Tanner and Alex to make a deal with an untrustworthy rival; Cavanaugh and Sara question three suspects in the suspicious death of a Silicon Valley CEO; the Hive endures unwanted visitors.
Tanner is offered new evidence in Mia's case if Sophe can prove someone is innocent of murder. Tanner and Sara begin depositions with AllSourcer for the rights to Sara's work and Sophe's code.
The team tracks a killer targeting online celebrities and broadcasting their final moments on a live-streaming platform; Sara worries about being banned from using Sophie
Tariq and the team use the Crowd to aid a friend and blogger targeted by an internet stalker; Tanner's pursuit of a mysterious series of payments tied to his daughter's murder leads to bruising consequences.
Jeffrey and detective Tom speak to Carlos, and he remembers something vaguely about a man taking a selfie with Mia on her phone. But something is wrong.
Tanner and Hale go to court to convince a judge to free Carlos. A man who was obsessed with Sophe, including Mia's case, is found dead. Investigating this man leads Tanner to information revealing a city official's killer.
