Billy Goat is a boy band made up of brothers Connor and Dean Gruff and friend Rafiq Bhavani enjoy local success in Northern clubs, but crave pastures new and fame and fortune. However there is one major stumbling block, their manager is a troll. In this world, trolls live side-by-side with humans and ‘Billy Goat’ are unfortunate enough to have bagged a canny and threatening troll as their manager, Grettongrat. He might eat mice as snacks, but this troll knows the music business and he’s got them locked in a watertight contract.