Old Lady Harley (2018-) #4

Harley's on to the next stop on her quest to find out how the Joker is haunting her from beyond the grave—and that's the 51st state of Atlantis! Sure, the city under the sea is all Starbucks and water-logged hipsters now, but since Aquaman was the last person to see the Clown Prince alive, can the King of the Sea provide Harley with some much-needed answers? And will they come in time before the Laughing Boys make their ultimate move?