It's dispatcher Marra Wargo's first week in her new position as Supervisor. Despite handling lifelong anxiety, she leads the team through a storm of emergencies, panicked witnesses, and a dog in danger.

911 Dispatcher Jackie Chappuies takes training rookie Hayley Kilbane into her own hands. Together they face back-to-back carjackings at the same gas station and a possible overdose that calls for immediate CPR, which Hayley has never instructed before...

Supervisor Christine "Mooch" Muccino drives the shift through a series of crises including a fatal car accident and a horrific shooting in broad daylight, but nothing shakes her to the core more than when she learns of a crisis at home.

Matt Reinke has learned the ins and outs of dispatching and is ready to apply for supervisor; he must help a young girl threatened with a knife and a panicked caller with a baby struggling to breathe.