The Lost Daughter. Lucretia Grindle

In Florence, a young American student goes missing. At first neither Alessandro Pallioti, one of the city's most senior policemen, nor Enzo Saenz, his deputy, are too concerned. But soon the men are horrified to discover that the older man Kristen has been spending time with is Antonio Tomaselli, a member of the notorious Red Brigades. Then, before the police can get a handle on the case, Kristen's stepmother, Anna, also vanishes. Before long Enzo finds himself enmeshed in a web of false identities, betrayed loyalties, and revenge. With the horrors of the past rising behind him and the women's futures hanging in the balance, Enzo Saenz is on unfamiliar ground and playing the most deadly game of his life...