Robert Ludlum definitely hits his straps with this one. The protagonist in this book is an ultra competent spy, based in Portugal. He is 'That Man in Lisbon'. The roots of the plot come out of WWII.
The Rhinemann exchange is diamonds for technology, pretty much, the Rhinemann being a scientist. Our man in Lisbon gets involved with a woman, and also realises a Jewish activist group is trying to stop what he is up to.
Definitely one of Ludlum's works to pick out, if you are only going to sample a few.
4 out of 5