Oxytocin

Addison Montgomery is an assassin with an impressive kill count who has never been caught, much less suspected of any crime. She is good at what she does, but she's not a monster, at least not in her eyes. She followed her own personal code of ethics, taking jobs with the mission to wash the world of filth. When she gets a contract to kill misogynistic neurosurgeon Derek Shepherd, Addison begins stalking and getting close to his wife, Meredith, for information that will help Addison succeed in her mission. What seemed like a typical job no longer seems so typical after Addison first lays eyes on Meredith and immediately becomes obsessed with her. As Addison further intertwines her life with Meredith's, weaving her into her web of subduction, the stakes become higher than ever when Addison no longer cares about killing Derek for the money, but for a much sweeter payment: Meredith all to herself.