"Traces Harleen Quinzel's journey from precocious, revenge-obsessed teenage girl to a hardcore justice-seeker on her way to becoming supervillain, Harley Quinn." --

"When Catwoman and Harley quarrel about who is the best burglar, they decide to settle it with a bet: who can steal the fabled Marble of Atlantis from the Gotham City Antiquities Gallery; but Catwoman cheats (in fact she already has the pearl), and Harley has to move fast to outwit her rival and win their bet"--

"Harley Quinn loves fighting crime with her classmates like Wonder Woman, Batgirl, and Supergirl, but she always does it her with own madcap style--and a big mallet! It's no surprise that Harley can't resist getting involved with an upcoming inter-school battle of the bands and a fantastic cosmic carnival that appears only once a year--and this year, it's coming to Earth! But as things get stranger, Harley knows how to get to the bottom of a mystery--and...

Harley Quinn, the Joker's girlfriend and former psychiatrist, has a plan to get revenge on Batman and Robin by using Poison Ivy's semi-sentient and carnivorous plants--but nothing ever seems to go right for Harley.

"Harley Quinn and Poison Ivy escape from Arkham Asylum and head back to Ivy's hideout; however, Harley proves to be a demanding roommate, so Ivy helps her take over a carnival and even grows her plant versions of Batman and Robin to boss around--but when Poison Ivy feels she has done enough and withdraws from the field, Harley discovers that being a criminal boss is a lot more difficult than she imagined."--

"There is a big Halloween Party at the Gotham City Museum, and Harley Quinn sees the party as an opportunity to steal some of the Museum's treasures--and it is up to Batman and Nightwing to prevent her from unleashing chaos on the innocent party guests."--

Explains the back story of Harley Quinn, a psychiatrist at Arkham Asylum who became obsessed with the Joker and turned into his demented sidekick to battle against Batman and Robin.

"This is it: the Clown Prince of Crime battles the Dark Knight Detective head-to-head for the last time. And one way or another, this will be the final chapter of their agelong conflict. The Clown Prince of Crime and the Dark Knight Detective go head-to-head for the last time. The Joker has never wanted to win before, he's never wanted his battle with Batman to end, but now his motivation has shifted. As The Joker's plan to assemble an army materialises,...

"Set in Harley's earliest days with the Joker, the DC Universe's most mischievious anti-hero makes the biggest mistake of her burgeoning criminal career...accidentally revealing the location of Mistah J's hideout! She tries to make it up to her puddin' after her colossal blunder--but the Joker's wrath is not easily soothed! And how will the Dark Knight make matters even more complicated? Paul Dini returns to his roots with an all-new take on the romance...

"When Alfred attends the prestigious Gotham Servants School, he is a clumsy and nervous boy going to fulfill his father's last wish--he will become…a butler! Pushed out of his comfort zone, Alfred must adjust to new surroundings and responsibilities while trying to ace his courses and get along with his classmates. But when he suspects that his school may be involved in a criminal plot, Alfred must look within himself to see if he has what it takes...