"Dad grabbed me by the shoulders and turned bright red. 'Never wear women's clothes again, do you hear me? Do you hear me, Guille?' And he said: 'The next time I hear you say in front of your uncles that when you grow up you want to be Mary Poppins, I swear to you that... I swear to you that...'

Guille gives the impression of a child without particular problems. He appears happy, is a diligent and well-behaved fourth-grade student, and is very close friends with a classmate from Pakistan, Nazia. Guille's mom works in Dubai and is completely absent, his dad has recently become unemployed, and the little boy - who doesn't talk about his mother - has Mary Poppins as his only role model. His teacher begins to sense that something is not quite right. She believes that his dependence on the - idealized in his imagination - Mary Poppins is just the visible tip of an iceberg, and seeks the help of the school's psychologist. In turn, the psychologist asks Guille to draw some pictures from his daily life, and thus the pieces of a very complex puzzle unfold before her...