this is a book I borrowed off my father about 15 years ago, not sure of the actual age of the book. I've tried Googling but I've not been able to turn up anything that fits my memories.
The book starts with our protagonist being released from jail in (I think) America, he's sent to the city of Bologna in Italy to act as a spy.
He's married, however he ends up divorcing his wife in favour of a woman he meets in Italy.
The reason he's in Italy is to investigate a terrorist cell I think - a representative of this cell meets him toward the end of the book and believes he is turning traitor on his home country. Our protagonist says something to tip the guy off that he's not turning traitor, so he gets tortured, ending up losing two fingers.
I distinctly remember a chapter titled "Bolognia on a plate".