Batman: Harley & Ivy (2004-2004) #1

A snafu by Harley sends Poison Ivy back to Arkham, and Ivy swears off working with Harley forever. But Harley won�t take no for an answer, so when Ivy breaks out and heads to South America, Harley�s right behind her. Oily politicians and cutthroat mercenaries abound!