When Sarah beat the Labyrinth, she earned the title Heart of the Labyrinth and a hefty dose of magic. Six years later, the Labyrinth is threatened, and Jareth needs her magic to defend the Labyrinth. But she has betrayed him to the Trolls, and all of Underground is in danger if the Trolls gain access to the magic the Labyrinth guards. Jareth/Sarah, HEA.