Being able to detect black magic isn’t all tea and crumpets—and for Theodosia Throckmorton, it can be a decidedly tricky business! When Sticky Will drags Theo to a magic show featuring the Great Awi Bubu, she quickly senses there is more to the magician than he lets on . . . Meanwhile, back at the Museum of Legends and Antiquities, Henry is home for the spring holidays and discovers an artifact that alchemists have been hunting for centuries. Soon, every occultist in London is after it.