Talking a suspect into sending his hostages out alive is NYPD Detective Gemma Capello's specialty. Alerted to a school shooting at her nephew's high school, she is one of the first officers on-scene. Detective Sean Logan and the Apprehension Tactical Team arrive next and immediately enter the school to apprehend the two shooters, while Gemma remains outside to help students evacuate. But as time stretches on, and there's no word of her nephew, her fear builds that he is one of the lost. When one of the two shooters holes up with a group of students and their teacher as hostages, Gemma steps in to negotiate for their survival.