After her parents died in a fire and her grandfather disappeared, Meg Whitlock thought life had come to a standstill. But after learning that the pocket watch her grandfather left her is in fact an intricate key, Meg, with the help of a groom named Will, learns of the existence of the Entertainers: members of an elite secret society dedicated to discovery and shrouded in mystery. Now the Entertainers have gathered in London, and Meg decided to join their ranks. But being the first girl in the Order is very difficult, and now that Will is away in Scotland, Meg is afraid that she has no one to trust but herself. Her fears are only confirmed by the sabotage that has occurred at the academy - and each altered invention causes more damage than the last. Threats lurk around every corner, but Meg tries to prove her worth as the first female Entertainer and uncover the identity of the one who sabotaged the academy while the inventions were ruined did not lead to anyone's death. And after finding evidence of a sinister and forbidden invention, Meg must stop it - or risk the entire future of the Entertainers.