Welcome to the Rebirth of Harley Quinn! Please fasten your seatbelts, keep your dog ears off the pretty pages (get a bookmark, you philistine), and forget everything you thought you knew about Harley Quinn!
On second thought, don’t forget anything, because you’d have wasted all those little grey cells you spent forgetting it. There’s a handy recap in the first 10 pages of the comic, after a gratuitous prologue featuring Harley and Poison Ivy lounging in a spa that doesn’t seem to do much for the story beyond giving us a look at how two sexy female super-anti-heroes look like lounging in a spa.