Fourteen-year-old Elle and her friends are going to a not-to-be-missed funfair. But a ride on the Ghost Train takes them further than they ever imagined. They end up in 1880, face-to-face with the criminal mastermind of The Vicious Circle - Millennia's Leapling ancestor, The Grandfather!

To Elle's surprise, he needs her expertise. An anonymous person has threatened to reveal The Gift to the media. If that happens, everyone will know that Leaplings can leap through time; no Leapling will be safe. Meanwhile, Millennia's power grows.

Will Elle work for a villain to save her secret community? Can she and The Infinites crush The Vicious Circle for good?