Harley Quinn's DLC story in Batman: Arkham Knight will take place before the main story, a blurb on Amazon has revealed.
The description for the game has been updated with information about the DLC, which describes how the content follows the villainness Harley Quinn as she infiltrates the Bludhaven Police Department to rescue her cohort Poison Ivy.
Here's what it says exactly:
"For the first time in the Arkham series take on the role of Joker’s psychotic side-kick Harley Quinn and wreak havoc inside the Blüdhaven Police Department. With this exclusive Story Pack experience events in the lead-up to Arkham Knight as you infiltrate Blüdhaven to rescue your partner in crime: Poison Ivy. Delve deep into Harley’s demented nature and utilize her devastating baseball bat to smash, crash and bash your way to a friend very much in need."
Players who preorder the game through Amazon will automatically receive the DLC pack.