It is the day of the simulation for Doc as Chief: Andrea goes back to wearing the lab coat for one day, but a sudden IT blackout of the hospital systems forces him to make a series of risky choices.

Giulia is forced to reckon with her bulky mother when her partner is hospitalized in the throes of an inexplicable syndrome. Just as Doc appears to be about to be Chief once again, Cecilia discovers something compromising about him.