The new six-part series will see AC-12 disbanded and rebranded as the Inspectorate of Police Standards, facing a challenging new climate.
The team's most sensitive case involves Detective Inspector Dominic Gough, accused of sexual predation, which may be a diversion from a larger threat.
Creator Jed Mercurio and the main cast expressed their excitement for the show's return, following the record-breaking but controversial sixth season finale.