Maddie is a compassionate, resilient 9-1-1 dispatcher in Los Angeles. A former nurse, she remains calm under pressure and fiercely protects those she loves, especially her younger brother Buck and her partner, Chimney, with whom she shares a daughter and a son. Buck is a fearless, big-hearted firefighter whose charm and impulsive nature drive him toward danger. Energetic and adrenaline-seeking, he masks vulnerability shaped by past struggles but grows into a dependable team member.