With a dad who disappeared years ago and a mother who’s a bit too busy to parent, Emmy is shipped off to Wellsworth, a prestigious boarding school in England, where she’s sure she won’t fit in. But then she finds a box of mysterious medallions in the attic of her home–medallions that belonged to her father…who may have gone to Wellsworth. When she arrives at school, she finds the strange symbols from the medallions etched into walls and books, which leads her and her new friends, Jack and Lola, to Wellsworth’s secret society: The Order of Black Hollow Lane. Emmy can’t help but think that the society had something to do with her dad’s disappearance and that there may be more than just dark secrets in the halls of Wellsworth.

After spending the summer at home in Connecticut, Emmy is eager to return to her friends at Wellsworth. Before she leaves, she receives a key to a safety-deposit box and a letter from her father, telling her to hide the surviving relics and to trust no one. When she returns to school, she realizes her best friend Lola is being framed by the Order for a crime she didn’t commit. Jonas informs Emmy if she gives up her father, he’ll set things right. It all comes to a head at an exhibit on Medieval manuscripts at the British Library. Will Emmy be able to stop them once and for all?