Locked In (S01E09)

Following the shocking murder of a crucial witness to a deadly chemical spill within the FBI headquarters, King and Maxwell find themselves confined to the building. With a dangerous killer on the prowl and the future of Special Agent Rigby hanging in the balance, the duo is pressed for time. They must unravel the mystery of the murder and secure a new witness to ensure justice is served at an upcoming Senate hearing against the corporation responsible for the spill.