For generations, the Kalotay family has guarded a collection of ancient and rare books that let a person walk through walls or manipulate the elements. Half-sisters Joanna and Esther have been raised to revere and protect these books of magic. All magic comes with a price, though, and for years they have been separated. Esther has fled to a remote base in Antarctica to escape the fate that killed her own mother, and Joanna has isolated herself in their family home in Vermont, devoting her life to the study of these cherished volumes. But after their father dies suddenly while reading a book that Joanna has never seen before, the sisters must reunite to preserve their family legacy. In the process, they’ll uncover a world of magic far bigger and more dangerous than they ever imagined.