Vicky and Stephen are separated parents, they're uncomfortable around each other but there's clearly still a spark between them. Stephen is an attentive 'weekend' dad, but Vicky is unnerved to see that he's in a new relationship with younger woman, Gemma. Stephen plays football with his 11-year-old son, Max, who seems to love it. But it's soon clear that Max is suppressing his true identity as a girl, in order to earn his father's approval. Stephen is unaware that within the confines of the family home, Vicky allows Max to dress and behave as a girl. Once Max begins secondary school, he soon becomes a target for bullies. As the onset of puberty intensifies, his feelings around gender become distressing and he deliberately cuts himself. Vicky and Stephen meet with a child psychologist and are referred on to a gender clinic. Determined to be a role model for Max, Stephen tells Vicky he never stopped loving her. Vicky isn't sure if she can forgive Stephen for leaving. We see in a flashback Stephen recalling the night he left. Stephen moves back in, hoping to encourage male bonding, and to win Vicky back. They begin to fall in love again.Encouraged by his sister, a nervous Max presents himself to his parents dressed in a girls' uniform. Lily explains that Max wants, from now on, to be known as Maxine. Vicky is conflicted, Stephen however, is angry. Stephen admits he didn't leave Vicky, he left Max because he couldn't cope with his feminine behaviour. But will Stephen be able to face up to the reality of Max's true self?