The devil has trouble sleeping. Caretaking human souls has taken its toll and he is suffering from insomnia. Enter Peter, a human soul and former musician who the devil believes can write music to help him sleep. Peter is under the watchful eye of Balthazar, a demon and the devil's right-hand man. Their budding friendship will be tested as Balthazar tries to keep the devil's weakness a secret and fight off an attempted coup. Meanwhile, Peter attempts this seemingly impossible task while adjusting to his new life in hell, and reminiscing about his previous turbulent life.