In Porter's exciting sequel to 2017's The Appraisal, art appraiser Helena Marsh attempts to trace the provenance of a painting believed to be the work of 17th-century artist Artemisia Gentileschi. Helena has her own fascinating provenance: she's the daughter of a forger, now dead, who taught her the tricks of his trade, and instilled in her a healthy disdain for authority. Helena's client, Gizella Vaszary, believes her husband is trying to pass an original off as a copy in order to undervalue it in their divorce settlement. Helena meets with Madam Vaszary's lawyer on a Rhine tour boat in Strasbourg, France. Before much information has been exchanged, the lawyer is shot and killed by an archer. Helena jumps from the boat onto the embankment and runs after the assassin. Soon the police are on her trail, which leads into the netherworld of shady eastern European gangsters, corrupt politicians, and collectors who will pay any price to get what they want. The forgery tips alone are worth the price of admission. Porter takes readers on an exhilarating ride. Agent: John Pearce, Westwood Creative Artists (Canada). (Apr.)