Ehhh I am just thinking about dropping this series.
I can believe that the bad guy is so deranged and intoxicated that he makes stupid decisions but this is just ridiculous. Ok, even if his plan succeed everyone would see that home murder his daughter. Even for high nobility it would result in a capital punishment. It would be just better to kidnap her in the restaurant and made an offering somewhere quiet, not the literal center of the capital.
Also the sudden switch of the old maid was just unbelievable, you are murdering someone and change your mind in a last moment? Come on! The same applies with beyond stupid reaction of Leslie. She was mistreated all of her life and she just trust one of Sperado's servant? Even if, why send of guards, it was petty and not in line with her character.