"Nachtschwestern" (Night Nurses) focuses on the nursing staff in the emergency room of the Cologne-West Hospital (KKW), who navigate their high-pressure shifts with both heart and professional skill. Everything that happens during the night ends up in their hands: traffic accidents, intoxicated teenagers, victims of bar brawls, and, occasionally, even embarrassing sex-related mishaps. Meanwhile, tensions and friction among the nursing staff itself add further strain to the situation.

After many years away from the night shift, Ella Fink returns to the ward. Her former best friend, Nora —who now manages the unit—harbors resentment toward Ella due to an incident from the past. Despite these inauspicious circumstances, Ella is determined to press on; after all, she is separated from her partner and has three children to support. Professionally, however, the two women must find a way to succeed together—regardless of the challenges standing in their way.