In the middle of Cork, in the middle of the day, a fire crackles in a local dance studio. Thirteen women, all promising stars of Irish folk, die in the blaze, their young lives cut short by a tragic accident. But where others see tragedy, DCI Katie Maguire sees murder. This is not the first fire to sweep through Cork. And in one previous case, the victims were dead before the fire was started. As Katie Maguire investigates the strange, obsessive world of competitive Irish folk dancing, she must face her most chilling killer yet.