A great plot and very attention-grabbing from beginning to end--especially if you're interested in Boston/Cambridge, American history, and thrillers! However, I downgraded my rating due to the style--which seems very dated to me. The book was published in 1978, and the dialogue (which includes a small but annoying selection of racist, agist, and sexist asides) badly needs updating. It also smacks a bit too much of the James Bond/Cold War popular culture of the time....with a little Get Smart thrown in.