She is called Simone. She is the illicit lover of Dr. Emile Bastien, who practices medicine on the rue de Maubeuge, treating Parisians and Germans alike. But Simone is more than his mistress; she is the guardian of all of his most dangerous secrets.

The mistress knows things about Emile's son and daughter - and about the wife who has hidden herself away on a French country estate. But there is one secret the mistress has not been let in on: an ingenious scheme that arouses her suspicions even as others plot to keep it from her at all costs.

The mistress retaliates by hatching a plan of her own revolving around a guilt-ridden SS officer, a suspicious death, and a chilling interrogation. She will turn the tables on the others and spin a web of greed and deception that will ensnare them all. The mistress waits to play her final card...until an unexpected reversal of fortune leads to a confrontation that will have consequences no one could have planned.