Sylvia Fox, an unsatisfied MI6 Spy, ventures to Italy to attend her niece's wedding. The celebration is disenchanted once the groom goes missing, leaving a woman's corpse behind. Now it is up to Sylvia to use her skills to investigate.

Sylvia assists at an archaeological site in Castello di Monterosa where she uncovers a skeleton of a girl who disappeared 25 years ago. Her investigation unravels a story of corruption, abuse, and sacrifice.

Sylvia is asked by her former husband and colleague, Adam, to investigate the arrest of Sasha Pavlenko, the son of a revered Russian Politician. Her investigation reveals a sinister blackmail plot gone horribly wrong.

Police arrest Antonella's friend for the murder of a pillar of the local community, who was found dead at the charity he runs; to clear her friend's name, Sylvia follows a trail of blackmail, family secrets, and illicit love.

Freelancing for MI6, Sylvia poses as the PA for a diplomat's widow at her luxurious lakeside villa; she's keeping watch on a South American politician, but when a dead body is found in the lake, Riva is astonished to discover Sylvia already onsite.

When an old foe abducts Sylvia, she must draw on her formidable reserves of physical and mental resilience to escape; while Riva investigates through official channels, Henry and Isabel run their own covert operation, all of them racing to save her.