Harley Quinn: Harley Loves Joker (2018-) #1

"HARLEY LOVES JOKER" flashback tale that ran as a backup in HARLEY QUINN last year! As far as The Joker's concerned, the new headquarters Harley built for them is absolutely perfect...but only she knows the whole place is rigged to come crashing down around them—and she doesn't know how to stop it!