Ava Michaels is nineteen years-old. Needing money to pay for university, she takes a gap year to work as a babysitter, a job given to her by an employment agency. What she didn't expect, however, was the gigantic house she would work at. Her employer, Simon, is filthy rich. The cook, Libby, talks too much. And the kids she has to watch...are not kids. "Do you know what age play is, Ava?" "The four boys I'm watching over are in a headspace?" Liam, headspace 14, the Big Brother. Louis, headspace 6, the Brat. Harry, headspace 5, the Affection Junkie. Niall, headspace 2, the Baby.