When a renowned Gotham doctor is found dead, the famous Joker toxin in his veins, everything seems to be designated Harley Quinn as the first suspect... But this one has nothing to do with it, and to prove her innocence, she will have to associate herself with the greatest detective that is: the Black Knight. A golden opportunity for the Queen of Coney Island to realize one of her biggest dreams: become Batman's sidekick, unless he is the one who is Harley Quin's sidekick? Contains US episodes: - Harley Quiann #55, 57-63