I think I’m going to loosely split v: the Baroness into three “acts”:

ACT 1. Priscilla & Edmund Staunton are married, and after the shortly after passing of Edmund’s father, they become Baron & Baroness of [insert location here]. After a few years of what seems to be a happy marriage, Priscilla accidentally discovers Edmund’s more sinister underground work of complicated heists and unwillingly becomes a part of it. It all goes downhill from there. To distract herself, Priscilla becomes a patroness of the arts and dedicates her time to Basilius, her racehorse champion, which she also competes in steeplechase races with.

ACT 2. Edmund dies. Priscilla - now more corrupted from Edmund than she wishes to confess - is left in moral shambles, lost in a grey mausoleum of Edmund’s lies. Priscilla continues her late husband’s work because she’s thoroughly addicted to adrenaline thrills, and baffling Scotland Yard for being the least suspecting guilty party. 

ACT 3. Scotland Yard begins to get too close to comfort after one of Edmund’s former underlings are arrested, so Baroness Priscilla flees to Paris, France. There she meets Paris’ greatest detectives: Inspector Aristide Javert. While they stand morally as enemies, personably they become mutual friends. But Priscilla’s kleptomania is hardly satisfied, so she targets museums and archeological artifacts when it isn’t the usual pick-pockets of the rich and famous at lavish balls. But more conflicted in her conscious now more than ever, she begins a tendency of returning that which was stolen… right back to Javert’s police headquarters. She remains an elusive mystery, ensuring she is two steps ahead of the game. All the while, as Javert continues to chase at her heels, she finds herself chasing something else which she is so inexplicably drawn to… his heart.