When a city's heroes become its boldest criminals . . .

For years the firefighters of New York's Engine 99 have rushed fearlessly into hot zones, saving countless lives and stopping devastating blazes in their tracks.

They've also stolen millions from banks, jewellery stores and art galleries. With their inside knowledge and specialist equipment, they've become the most successful heist crew on the East Coast.

Their newest member, Andrea 'Andy' Nearland, is not what she seems either. She's an undercover operative, hunting the men of Engine 99 for a host of crimes - including the murder of an off-duty cop and the disappearance of a mother and child.

As the clock counts down to the gang's most daring heist yet, loyalties begin to fray and mistrust boils over. Andy's career is all smoke and mirrors, but infiltrating this crew of 'heroes' might prove to be her most dangerous job of all . . .