A review by just_fighting_censorship
Harley Quinn, Vol. 1: Preludes and Knock-Knock Jokes by Karl Kesel

2.0

Harley turns on the Joker and sends him off to Arkham and she decides to become a solo act. There are appearances from Ivy, Catwoman, Two-Face, and the Riddler but none of it is very memorable. Harley throws a party, hires some henchmen, and pulls of a few lame heists.

The humor isn't there and the plot is practically non-existent.