Brave firefighters, rescuers and paramedics of the 51st Chicago Fire Department perform a very stressful, exciting and dangerous job, from which all other people, as a rule, run away headlong. But because of the huge responsibility, the most important responsibilities that lie on them, these brave men and women, unfortunately, can not avoid personal losses. One of the team members has a well-deserved reputation, the second has an overblown ego, the third is slightly cheeky, plus stressful situations in which decisions need to be made in a split second – all these factors and psychological pressure lead to numerous quarrels between colleagues, constant mutual accusations about the death of other team members. But all the differences immediately fade into the background as soon as the alarm sounds, and each of the heroes is ready to risk their lives for the other. This fascinating, action-packed American TV series will allow the viewer to look from the inside at the noblest profession.