For starters, I hear that we initially find each of the leads dealing with their own individual issues before eventually teaming up. What are they up to, you ask?
Black Canary (Smolett-Bell) is a singer who fights crime at night.
Huntress (Winstead) was a killer for Black Mask right up until discovering that he killed her family. So now she's hunting him down.
Harley Quinn (Margot Robbie) is trying to move on from The Joker (who is referenced, but not seen).
Renee Montoya, on the other hand, is on Huntress and Black Canary's trail because of the body count they've amassed.
What ultimately brings them together, as was referenced in the synopsis released online in August, is Cassandra Cain. See, Roman Sionis, aka Black Mask, has kidnapped the young Ms. Cain because he sees her as "The Perfect Assassin," and he's grooming her to take the spot once held by Huntress. I'm told Cain will be handled similarly to the way X-23 was depicted in James Mangold's Logan– except without any abilities, since that's not Cain's thing. She's just really good at killing people thanks to a tragic upbringing where her father turned her into a weapon. Similar to X-23, her dialogue will be extremely limited as she's presented as a tormented, yet silently deadly killer.
This next part veers ever so slightly into *SPOILERS* so proceed with caution…