Joker / Harley: Criminal Sanity (Joker / Harley: Criminal Sanity #3)

Harley Quinn follows the evidence - and it leads her to a dangerous conclusion: she might know the true identity of the serial killer she’s hunting. But as Harley digs deeper into the Joker’s past, he is watching her... and leaving a trail of bodies in his wake. Gotham has never needed a hero more!