County Durham, during the endless, violent 1984 strike against the Margaret Thatcher closure of British coal mines. Widower Jackie Elliot and his firstborn, fellow miner Tony, take a dim view of eleven-year-old second son Billy's poor record in boxing class, which worsens when they discover he sneakily transferred to the neighboring, otherwise girls-only-attended ballet class. Only one schoolmate, closet-gay Michael Caffrey, encourages Billy's desire, aroused by the teacher, Mrs. Wilkinson, who judged him talented enough for private lessons, to train and try out for the world-renowned Royal Ballet audition. Only the prospect of a fancy career unimagined in the pauper quarter may twist pa and big brother's opposition to indispensable support.
Shola, or Rocks, as she's known, lives in a London council flat with her younger brother Emmanuel and their single mother. Mum is busy and stressed, leaving Rocks to spend all her free time with school friends. One day, she comes home to find her life radically altered: she is suddenly on her own with a child to take care of. Gavron could easily have steered Rocks into miserabilism, but delivers instead a surprising portrait of resilience. Rocks is mercurial, impulsive, and deeply sensitive - not unusual for her age, she sometimes makes desperately poor decisions, for what look to her like good reasons. When her closest friend Sumaya tries to help, Rocks doesn't know how to accept it, blinded by Sumaya's two-parent household and relative comfort.
Poppy and Branch discover that they are but one of six different Troll tribes scattered over six different lands devoted to six different kinds of music: Funk, Country, Techno, Classical, Pop and Rock. Their world is about to get a lot bigger and a whole lot louder. A member of hard-rock royalty, Queen Barb, aided by her father King Thrash, wants to destroy all other kinds of music to let rock reign supreme. With the fate of the world at stake, Poppy and Branch, along with their friends, set out to visit all the other lands to unify the Trolls in harmony against Barb, who's looking to upstage them all.