It's a "point one" issue so that means it's the perfect jumping on point, right? Guess again. Jonathan Hickman creates his own rules for this issue and it will catch you off guard.
It's a good thing Red Hood and friends were in Gotham last issue so they could stick around for the big Batman crossover event. Seeing Jason take part is pretty fascinating.
A convicted murderer, Derek Mitchell escapes from jail looking for vengeance on Mortimer Kadaver, but is involved in an accident on the way which turns him into a corrosive man, his entire skin burned with chemical fire which can eat through walls and floors or maim human flesh. His encounter with Kadaverleaves the latter with a handprint burned onto his forehead and leaves Mitchell inert, although he surfaces at least two times after this.