An explosive story guest-starring the Penguin, the Mad Hatter and Harvey Bullock! Detective Driver and Josie Mac are desperately trying to crack an unsolved mass murder from 10 years ago, one that has uncertain ties to the Mad Hatter. But a delicate investigation is completely shaken up now that disgraced detective Harvey Bullock is on the case! But Bullock's not the man he used to be, and with the Penguin inexplicably in his sights, things are about to get messy!