A woman has a husband who is working for the CIA. He is away on business when she gets a letter from him saying he can't call but he needs to tell you that you will be living with a secret service agent for protection. The next day he arrives all dressed like the men in black. He is courteous but acts like he owns the place. Of course her husband did write he has access to anything in the house. He will be scouring for information about her and him. She hated the idea but went along. He seems to know so much about her already. What foods she likes, what shows she likes, she wonders what else he knows. She is also infactuated with him but hates herself for it.
The rest is up for discussion. He could be the one who wrote the note and the husband knew nothing about this or is dead. The note is typed. He may then take her by force and kidnap her or she can fall for him. He could have been spying on the two of them for months to learn all he knows. We could include the pre move in scenes if so desired.
Thanks for reading and hope to hear from you.