Synopsis

At Firehouse 51, a firefighter fights for survival, but his condition rapidly deteriorates as paramedics strive to stabilize him. Simultaneously, Dr. Natalie Manning anticipates the arrival of her child, while detectives from Chicago P.D. investigate the circumstances surrounding a woman rescued from a blaze. This crossover event begins with the tenth episode of Chicago Fire, season four, titled "The Beating Heart (I)," and continues with the tenth episode of Chicago P.D., season three, entit