When Mattie reveals that the Synths are planning to break into the Silo, Laura is determined to find Niska and ask for her help. Mattie asks Max to help save Leo from Hester’s influence. Toby receives a disturbing message from Renie. Karen seeks out Athena’s expertise and makes a life-altering decision. Mia and Hester break into the Silo, but things don’t go according to plan.
In a parallel present day, where the latest must-have gadget for any busy family is a ‘Synth’ (a highly realistic humanoid servant that’s transforming the way we live). In hopes of reducing their workload, a suburban family purchases a new Synth only to discover that sharing life with a Synth has quite far-reaching consequences.