[@Irredeemable]

Well, Mien's done some terrible things in her life since she took over the crime organization.

Assassination, murder, torture, abuse, human trafficking, drug trafficking...it's bad and illegal, she's probably done it, and I can definitely see her having more than a few enemies. 

If you want Lars to have been hired by a private source to get revenge for something she did, then I think it could definitely work.