Forced to flee Venice once again, Chiara and Pasquale hope to find a place for themselves among the witches and glassmakers of London. But when Chiara learns that Dowager Princess Zilia is throwing so-called hidden purveyors of magic into prison - including their friends and relatives - she knows she can no longer run. She and her loved ones will never be safe unless she returns to Italy to face her greatest enemy.
But what chance does a mere glassmaker have against one of the most powerful women in the Venetian Empire?

In this conclusion to The Glassmakers series, various fairy tale retellings and elements find their way into a magical alternate history, including "Hansel and Gretel" and "The Pied Piper of Hamelin."