The other review that Amazon has posted for this book was written for another book entirely. Amazon haven't corrected their mistake yet. Some things take years to be noticed! I haven't read this book yet and would be interested to read a good review by someone who has. Certainly the issue is an important one.
A British Intelligence agent, trained by George Smiley, at the end of his carreer, finds himself led back into a situation reevoking his past work during the Cold War. Fine characters and intriguing action. Excellent.