Double Act (novel)

The book takes the form of the twins alternately narrating the story of their life in an accounts book. Ruby and Garnet are ten-year-old identical twins living with their father and grandmother since their mother, Opal, died. The two have always been close despite their differences—Ruby is sociable, headstrong, and dreams of being an actress, while introverted Garnet is content to let Ruby dominate their relationship. The twins have their own secret language, and they don't like to make friends at school because they have each other. When their father gets a new girlfriend, Rose, and a new job, their once stable relationship is thrown into turmoil, as the relationship leads to feelings of betrayal from their father to their late mother, and it comes with a price—leaving their grandmother behind for a bookshop in the country.

Ruby insists that the girls should not stand for their new lifestyle. They get into trouble with the village bullies after throwing mud at them. Garnet starts off well in new school and works hard, but once she makes a new friend called Judy, Ruby sulks and ignores her twin. Garnet quickly changes her actions to repair their relationship. After this, they do not behave properly in school and do not talk to anyone else. They never listen to Rose and feel angry and neglected.

Ruby finds an article about auditions for a TV adaptation of The Twins at St. Clare's, and is keen for the two of them to go ahead and audition, even though Garnet declines and their father doesn't agree. Surprisingly, Rose is supportive, although her efforts are for nothing, Ruby plots and succeeds in them running away to London for the audition. When their moments comes, Ruby confidently does her audition well. Garnet however is very scared, and is about to deliver a good audition but their father appears just as she is about to begin, and she cannot say anything. She feels terrible for spoiling Ruby's chance at fame.

Near summer, Ruby, realising that the TV movie is being filmed at a prestigious boarding school for girls, Marnock Heights, fixates on the idea of the twins becoming " the real Twins at St Clare's" and decides that the pair ought to sign up for scholarships—of which there is only one. Despite their father's early hesitation to the idea, he ultimately agrees, and they sit the entrance exam. Ruby is disgusted by Garnet's descriptive and mature writing but remains confident they will both pass. It is later revealed that only Garnet won the scholarship. Ruby is devastated as she was confident that she would win it if they both could not 'wangle one' together. Garnet is torn between pleasing her sister and doing something different, for once. Meanwhile, Ruby refuses to talk to her, and often wanders off on her own. She is determined to be different from Garnet and ends up cutting her hair short in pursuit of that goal.

She does not let herself be around Garnet for the whole summer, and even though they both feel as though they are missing something, Ruby is too proud to apologise while Garnet wishes Ruby would accept her apologies. After making friends with someone she previously considered rather a bully, Ruby starts to realise that she and Garnet do not need to be the same, and do not have to do the same things, to be happy. She also realises, alternately, that being together would have helped Garnet feel better about leaving. Ruby finds a friend in Rose, also, who encourages her to say sorry to Garnet. During this portion of the book, Ruby writes in a notepad she calls a MEMORANDUM.

In the end, Ruby apologises to Garnet, and they both realise that they can still be together while apart, as long as they remember each other. Garnet leaves for the school, and writes a letter about how much she is enjoying it.

Adult versions of Ruby and Garnet appear in The Butterfly Club. Ruby has become a children's television presenter named Ruby Red, and Garnet is a scriptwriter and producer.

The television film was made in 2001 for Channel 4 and aired in 2002, starring Birmingham twins, Zoe and Chloe Tempest-Jones.^{[citation needed]}

In the book, the TV show the girls audition for is a TV adaptation of The Twins at St. Clare's. However, in the TV movie, the book is called The Terrible Tempest Twins.

In the book the twins live in London. However, in the TV movie, they live in Birmingham.

Publishers Weekly described it as "an unexceptional mix of familiar plot devices" and recommended it (or did not) for readers age 9 to 12.^[3]