The Beating Heart is the tenth episode of the fourth season and the 79th overall episode of Chicago Fire. It is the first part of a three-part crossover between Med ("Malignant") and PD ("Now I'm God") .
Summary
While a member of Firehouse 51 falls victim to a near-fatal stabbing, the other firefighters rescue a woman who attempted to commit suicide.
Plot
In this Episode of Chicago Fire, one of their own is the victim of a near-fatal stabbing. This is the first part of a three-part Crossover between Chicago Med ("Malignant") and Chicago PD ("now I'm God).