An unremarkable family ring - lost when its owner was killed in the catastrophic eruption of Vesuvius - is excavated after nearly two millennia buried under tons of lava, setting off an extraordinary sequence of events.

A brazen robbery, and the ring is lost again. The theft and subsequent investigation, inspire twelve-year-old Cristiano Rossi to dedicate his life to the search and recovery of stolen artefacts.

Fast forward twenty years. Whispers of a rare item being offered for sale on the black market, initiates a joint operation between the Italian and British branches of the, colloquially named, Art Squad.

Hannah Vallier and her tech savvy assistant, Bryony Emerson - whose abilities to track down the untraceable, led to them assisting the UK Art and Antiquities Unit - have unearthed an intriguing thread. Reluctantly, Cristiano agrees to team up with the pair to thwart the traffickers, retrieve the artefact and, hopefully, dismantle the site.

What ought to be a routine assignment is complicated by a rogue operative, an unexpected romance, an ancient connection, and a very angry ghost!