A young woman named Anna nervously undergoes a rigorous physical exam to become a 'nighttime nanny' for the wealthy Zimmer family. Many applicants are disqualified for minor health issues, but she passes. She learns only six out of 200 candidates will advance, and the legendary billionaire Master John will conduct the next round himself. Driven by desperate poverty and a promise to care for her younger sister, Anna vows to win the $100,000-a-month job at all costs, setting her on a collision course with intense elite competition.