Agatha Christine, aka AC, is ten years old. She really wants to be a private detective and has her own office in the family basement. She doesn’t care that people think she is weird. One day she meets a boy in the local shop. His name is Vincent and he is beautiful and mysterious. A loner, just like her. AC gets a weird feeling in her stomach every time she sees him, and she takes it as a warning. There is something suspicious about that boy. She ditches all other investigations and devotes her full energy to surveilling Vincent.