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 whom -- he'll face in defense of his beloved hometown, only that innocent lives are at stake.