The Episode At Toledo: A Julia Probyn Mystery, Book 6 by Ann Bridge
In the beautiful countryside of Portugal, erstwhile British secret agent Julia Probyn is to attend a royal wedding. But her former acquaintance, Countess Hetta Paloczy, 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 assassins, these women are no strangers to danger. In The Episode at Toledo, book six in the series, Julia is joined by Hetta and Luzia, uniting all our heroines from The Julia Probyn Mysteries.