This book is about Cassandra, Max-Ernest and their adventure where they try to stop The Alchemists of the Midnight Sun from descovering "The Secret".
Exactly what the secret is is never reveled in the book but it is rumored to be the secret of inmortality. It was discovered in Egypt and passed through generations. It is currently on a papyrus scroll somewhere in the world.
The Alchemists of The Midnight Sun
The Alchemists of the Midnight Sun are a group of people dedicated to finding the Secret. In the first book, they have a complex somewhere around the city. It is burned down and they rebuild it at an undisclosed location. In the second book, they do not really have a base. In the third book, they have a secret HQ in the Amazon. They include dazzingly beautiful Ms.Mauvias and Dr.L.
The Terces Society
The Terces' name is secret backwards and they have existed for millenia. They include Pietro Bergamo, the leader, Lily Wey, a deadly violin player, and others.