When Itzy Nash spends the summer at the exclusive Carlyle Hotel in New York City, she discovers that some of its other guests include otherworldly demons, and she must save all of humanity when the queen of the damned checks in.
Eleven-year-old Ivy Manx sets out with her friends for the dangerous city of Rocamadour, where poison and the evil Tasters Guild rule, in the hopes of finding a door to the sisterland of Pimcaux and fulfilling a great and ancient prophecy.
When eleven-year-old Ivy's uncle, a famous healer, disappears, she and a young taster named Rowan set out to find him, only to be pursued by people who may be after Ivy's red bettle, her mysterious elixir, or Ivy herself.