This book, which occurred earlier in the "Banks and Cabbot" series, is better than his 2 most recent books (both of which were hard to believe). It's an easy read, and will keep you interested while you read it.
I'm not altogether sure, however, that the series is improving with age. The best written of his books (that I've read), were the two books near the start of the series. This is sort of middling, while the 2 newest books are less effective. Consequently, I'd recommend that people start at the beginning of the series and take it from there.