When tech prodigy Cress Darnel is tasked with a secret project, she's told terrorists and foreign governments alike would do anything to get their hands on her work. But Cress is too distracted by her new co-worker to heed her boss's warnings. Carswell Thorne is sexy and charming, with stunning eyes that make her want to violate more than a few HR policies on inter-office dating.

Desperate to not be alone again for the holidays, Cress hires a man to pose as her boyfriend for her family's annual Christmas celebration.

[Mariposa Spanish for Butterfly] Today was the day. The day when Marinette would tell Adrien how she felt about him. But then... It all goes wrong... Witness the fall of Ladybug and the rise of Mariposa, Princess of all Akuma's.

Cress signs up for an online dating service, but her relationship with her best friend complicates things as she searches for her one, true (e-)love.

Snapshots of Thorne's POV while Cress was in the suspension tank.

Adrien looked over at the shy girl as she laughed and joked through their classes. Why wasn't she like that with him? Had he done something wrong, did he make her uncomfortable? Did he intimidate her? He wanted to hear her jokes too, he didn't understand what he had done wrong, but he was determined to fix it. He would get to know Marinette better, maybe then she would be at ease.