Ramon, a twelve year old visit a bicycle shop to fix a puncture. There he meets an old man named Mario, a former amateur cyclist, and was fascinated by a bike that just built with parts from different models. The old man decides to give it away.

A child wakes up screaming every night. Horrible nightmares torment him, but when he wakes up he can't remember what his fears are. His loving mother will try to comfort him without knowing that his nightmare will soon come true...

The story is told using non-linear flashbacks during the court case that determined her fate, giving us a detached and non-judgemental portrait of Nina, a lonely child of a carefree single mother. Having never had a father figure, she seeks affection through older men before she falls in love with a younger man called Sergio, an apprentice under her husband Miguel. The film highlights various episodes from her life, culminating in the murder of her lover, and the apparent cannibalism that follows.