April 15, 2019. After losing her lover in a fire two months prior, firefighter Alice returns to active duty - with all of France and the world watching.

As Notre-Dame burns, Max goes to desperate lengths to find Victoire. General Ducourt confronts his demons. Elena finds a friend in an unlikely place.

Ducourt and Varèse butt heads over their plan of attack - and their priorities on what to save. Victoire finds herself stuck with Billy.

After the spire falls, the brigade takes perilous measures in order to regroup. For Max and Victoire respectively, time is running out.

Alice's revelation sends Ducourt reeling. Varèse accompanies a priest to save the Crown of Thorns. A disturbing new lead brings Max full circle.

The brigade mounts a dangerous operation to attack the blaze from inside the belfry. Freed from the nave, Elena sees her life in a new light.