Team Flash discovers that Spin (Spencer) has a menacing schedule for Excess against Flash in order to achieve fame for herself. Iris learns why Nora is so cold to her, and Ralph has a comeback in the shape of a new lead on Cicada.
Nora lets something slip about the future that devastates Iris. In an attempt to distract his wife, Barry asks Iris to team up to stop a new meta, Rag Doll. Meanwhile, Caitlin learns something about her father.
Barry and Team Flash come up with a plan to stop Cicada. However, the plan calls for Barry and Nora to travel back in time to gather some key necessities. Meanwhile, Sherloque's suspicions about Nora continue to grow.
While Nora grapples with the revelation that Thawne killed her grandmother, Team Flash must stop the formidable team-up of a newly sprung from jail Weather Witch and Silver Ghost, a new meta-tech villain who can control engines and motorized technology. Meanwhile, Caitlin and Cisco discuss creating a meta-human cure.
During a battle with Cicada, Nora is severely injured; due to Cicada's dampening powers, Nora's speed healing isn't working; Barry and Iris are scared for their daughter's future; an enraged Flash confronts Cicada in a brutal battle.
When Sherloque wants to use a memory machine on Barry and Nora to help gain access to Grace's memories, Nora panics, fearing her parents will find out the secrets she's been keeping from them. Nora secretly decides to use the machine on her own which ends in disaster after she gets trapped inside Grace's mind. Barry and Iris go in after their daughter and Iris is brokenhearted by what she finds. Meanwhile, Ralph tricks Cisco into going out for a night out on the town.
Barry and Ralph must go undercover as criminals in an illegal black market to purchase a device that could help them stop Cicada. Once inside, Barry and Ralph find their morality tested as they slip deeper into the criminal world, eventually having to choose between committing a crime, or losing the means to defeat one of their greatest foes. Meanwhile, Iris investigates a lead on Cicada's whereabouts and ends up in a dangerous situation.
Team Flash finds out that suburban mom Vickie Bolen is in danger, and they race to save her; they discover she's a metahuman who is hiding her abilities from her family; Barry encourages Vickie to share her secret with her family.
After discovering that Nora is working with Thawne, Barry and Iris disagree about how to handle their daughter in the wake of this shocking news. Team Flash isn't sure they can trust Nora, so they go through her journal to find out exactly how she came to work alongside their greatest nemesis.
Caitlin must resolve her relationship with her mother when Icicle returns to enact the next phase of his devious plan; Iris takes matters into her own hands after Barry makes a decision about their family without consulting her.