The Episode At Toledo: A Julia Probyn Mystery, Book 6

In the beautiful countryside of Portugal, erstwhile British secret agent Julia Probyn is to attend a royal wedding. But her former acquaintance, Countess Hetta Páloczy, the young Hungarian refugee, unwittingly gets them both tangled in Cold War intrigue. After Hetta accidentally uncovers a Communist plot to assassinate an American admiral in Spain, she is a marked woman yet again and must flee to Portugal. But even in the tranquil beauty of Gralheira, peril lurks. Unluckily for the assassin...