After making love with Andrew, Millie falls asleep in her small room, noting the stark contrast between her uncomfortable cot and the guestroom mattress. She reflects on how unexpected it is to be intimate in the maid’s quarters, given Nina’s strict no-guests rule.

Millie wakes around three in the morning with an urgent need to use the bathroom and notices Andrew is no longer beside her. Assuming Andrew retreated to his own bed due to the cot’s discomfort, Millie reassures herself this will be her last night in the cramped room and heads for the door.

When Millie tries the doorknob, it won’t budge. She tries again, harder, until she realizes the door isn’t stuck—it is locked. Panic rises as she grasps that she is trapped inside her room in the middle of the night.