"You've seen Harley Quinn obsess over The Joker. You just haven't seen it quite like this before. With its gritty portrayals of forensic science, death, and obsession, Joker/Harley: Criminal Sanity represents a much darker foray into the DC Universe. In Gotham City, where heinous acts of violence are a daily occurrence, the GCPD relies on Harley Quinn, a young forensic psychiatrist and profiler, to consult on their toughest cases. But Harley is haunted...

"Joker is getting out of the madhouse and, though he's laughing, he's not happy. While away, his fellow rogues have sliced and diced his chunk of the pie and sold it off for scrap-- thinking he was gone for good. But now Joker's back on the street and eager to make Gotham bleed like it's never bled before. During this long night of the soul, he'll cross paths with the likes of The Penguin, Two-Face, Killer Croc, Harley Quinn, The Riddler and, of course,...

"Vigilante justice meets criminal justice on the steps of the Gotham Central Police Department just after Batman's first encounter with the Joker! When Batman turns the Joker over to police custody, his work is far from done. As the Joker continues his senseless killing spree while imprisoned, Batman quickly realizes that this psychotic freak is not ordinary laughing larcenist..."--P. [4] of cover.

Batman finds himself forced to make a difficult decision when the Joker's manic run for governor coincides with the reappearance of his former girlfriend, Silver St. Cloud.

They can barely stand each other, so how will they possibly deal with the World's Greatest Evil? What legacy can two of the world's most enduring icons of justice leave once they discover an ancient evil has been living inside the world they protect for centuries? Can Batman and The Shadow save the world without destroying it in the process?

Batman subjects himself to intense mental and physical training as he becomes a successful crime-fighter, and is eventually challenged by an insane criminal known as Jack.

"This is it! The epic conclusion to Harley Quinn's twisted retelling of the story of the hit video game Injustice: Gods Among Us! Harley and the Joker are back together, but is Harley Quinn the typical pawn in Joker's evil plot, or is she setting an elaborate trap for him to fall right into? Seeing as this story is told through the less-than-lucid lens of Harley, you can probably guess which side she thinks she's on... As the world turns ever closer...