Athena challenges Milo’s ethics and is shocked when he reveals his real plan. Mia’s surprise return has ramifications for the Hawkins family. Mattie finds Leo but can she trust him with her secret? Max resolves to begin a new community of Synths; when he learns how far Leo is prepared to go to complete his mission, he takes matters into his own hands.
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.