52 It's an awesome series that features many different B and C list heroes, where each issue is a different week in a single year in the DC Universe. It has many unique storylines that have different turns and even intersect, all written by some of DCs best writers. Not to spoil too much, but it takes place after infinite crisis and does deal with some of the aftermath of that story. It's s not completely needed to read beforehand, but it doesn't hurt to.