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In a ruined and toxic future, thousands live in a giant silo deep underground. After its sheriff breaks a cardinal rule and residents die mysteriously, engineer Juliette starts to uncover shocking secrets and the truth about the silo.
“The key to the future lies in the past.”
2026
Rebecca Ferguson
Juliette Nichols
Common
Robert Sims
Harriet Walter
Martha Walker
Chinaza Uche
Paul Billings
Avi Nash
Lukas Kyle
Rick Gomez
Patrick Kennedy
Tim Robbins
Bernard Holland
2023
Sheriff Becker's plans for the future are thrown off course after his wife meets a hacker with information about the silo.
Juliette, an engineer, pieces together what might have led to a co-worker's mysterious death.
In her hunt for a new sheriff, Mayor Jahns clashes with Bernard. Juliette strikes a deal to keep the generator running.
Juliette tries gaining the trust of Deputy Marnes as they work to uncover the truth about recent tragedies.
Sims appoints Billings as chief deputy to keep tabs on Juliette, whose efforts to solve two murders lead to a showdown.
During her investigation, Juliette uncovers disturbing secrets about someone she thought she knew.
Bernard seeks Juliette's cooperation as he grows increasingly concerned about the silo's security. Juliette asks her father for a favor.
New information causes Juliette to see her family's past differently—and she finally gains access to the silo's biggest secrets.
Racked with guilt, Billings sets off on a personal mission, only to discover a mind-blowing clue from Juliette.
Juliette's fate seems sealed when certain truths finally come to light.
2024
Juliette finds sanctuary in a silo long ago destroyed by war, thinking she's alone.
In Silo 18, shock and unrest take hold in the wake of Juliette doing what no one's done before.
Bernard turns to Judge Meadows for help. Billings begins to wonder if he's being lied to. Juliette finally meets the man in the vault.
Juliette sets out on a dangerous quest to retrieve a suit so she can return home and save her silo. Mechanical plans a meeting with Judge Meadows.
Sims finds himself with a new position. Juliette learns Solo isn't being honest. Bernard and Lukas make an important discovery.
Bernard enacts a plan to root out Knox, Shirley, and Walker. Billings takes a stand. Solo saves Juliette's life and wants something in return.
Lukas is assigned a mission. Mechanical sends a powerful message. Juliette embarks on a perilous descent—and confronts a new danger.
Juliette discovers something's happened to Solo. Bernard makes an offer to Walker. Lukas meets with Salvador Quinn's descendants.
Billings' faith is shaken. Lukas heads to the down deep. Knox identifies the traitor. Juliette uncovers the truth about Solo's past.
The rebels make their move—and so does Juliette.
