Ace of Hearts (Labyrinth fanfiction)
Harley "Ace" Jones is the Williams' preferred babysitter, after Sarah had complained about taking care of her baby brother, Toby, one too many times. But she's got a secret that could change everything.
One night, Ace is running late to come babysit Toby, and when she arrives, she finds that Sarah has wished away her half-brother. Angry at the girl's foolishness, she demands that she undo what she has done and bring Toby back, calling Sarah a half-wit and a jealous child.
Sarah becomes offended, and Ace finally calls forth the goblin king, Jareth.
He is surprised at the summons, and when Ace and Sarah (wanting to prove that she's not a jealous, half-witted child) demand to get Toby back, he shows them his Labyrinth and challenges them to solve it within 13 hours or Toby will become a goblin forever.
But Jareth has been watching Ace for a long time, and things may not turn out the way they were expected to.