In the Carnival days leading up Mardi Gras, Detective Caleb Rooney comes under investigation for a murder he is accused of committing in the line of duty --- as a Major Crimes detective for the New Orleans Police Department. Has his sideline at the Killer Chef food truck given him a taste for murder? While fighting the charges against him, Rooney makes a pair of unthinkable discoveries. His beloved city is under threat of attack. And these would-be terrorists may be local. As crowds of revelers gather, Rooney follows a fearsome trail of clues, racing from outlying districts into city center. He has no idea what --- or who --- he'll face in defense of his beloved hometown, only that innocent lives are at stake.