This supposed to be funny. But it is not so funny if you understand Chinese and know that most Chinese, even who don't speak proper English, don't sound like that as describe in the book.
The dialogue itself would have turned me off.
But wait, there is more.
There is no main plot. There is a plot but it is too stupid to call it a plot.
The voice of the Chinese spy sound like someone making fun of themselves in China Town.
And I know you know how it sound like, there isn't much to go on.
So, if you are a fan, but not a loyal fan that have to read every single book he wrote, skip this one.