Batman: Legacy — Chuck Dixon

A deadly plague has been loosed upon Gotham City, forcing Gotham's wealthiest citizens to take refuge in a guilding ghetto of their own design, unaware that money is no protection from the virus. Now it's up to Batman and Robin to find a cure for the mysterious virus--with the help of their unlikely allies, Catwoman and Azrael. And when the virus returns in mutated form, Batman and his allies must race across the globe to find its source--and a cure. Graphic novel format.