A year after the resolution of the archaeological intrigue which put Katherine Sinclaire’s life at risk, the nightmare of a new, unsuspected enemy has returned. During her first novel launch, a man shoots himself in front of Katherine after throwing her an antique ring engraved with two names. Tormented by a chain of murders and five enigmatic books, Katherine will be sucked back into a bloody treasure hunt, following the trail of Angelica, a mysterious medieval woman. Her portraits will lead Katherine on a turbulent journey through ancient underground tunnels, used as escape routes by the heretics and designed to protect one of the greatest secrets in history.

From Britain, the land of tides, to Fra Dolcino’s Prealpine hideouts Katherine will sense a very deep connection with Angelica… even stronger than the fate that is about to lead her to a point of no return.