Harley Quinn (2000-) #21

Harley's trapped in the ultimate prison by a demonic fellow whose name begins with the letter "E." She enlists the help of some familiar (if unexpected) faces in a massive attempt to regain her freedom! Harley's got a gaggle of unusual super-humans on her side, but it ain't easy to come back from...well, wherever ? especially with a bounty hunter gunning for your head!