The City of Guardian Stones
Hyacinth has just saved London, and possibly the world, from a magical conspiracy stretching back centuries. Not bad for a week of summer holiday. But why is her family linked to the ancient secrets of London? Hyacinth needs to find out, and when she discovers that Ancient Roman stones are being stolen from all around the city, it’s time for another adventure with the help of friends new and old, including Oaroboarus, a giant pig in a swimsuit.