In the hills above Marseille, Oasis Natrun is a highly secret health spa for mummies, equipped with the very latest therapeutic innovations both magical and medical. To Dr Greta Helsing, it sounds like paradise. But when she takes the job of interim clinical director, it isn't long before Greta finds herself faced with a medical mystery that will take all her diagnostic skill to solve.

With help from her friends and colleagues - including demons, witches and the inimitable vampyre Sir Francis Varney - Greta must put a stop to this mysterious illness before anybody else crumbles to irreparable dust.