Yes - you're right. This is what I meant by the early books being more believable; once he started branching out into things like Missee Lee they lost their credibility a bit. But I think that's true of many authors - their first books are often the most realistic, and then they feel the need to become more outlandish to keep coming up with new things (a bit like many of the long running TV series' - they should quit whilst they're ahead). The only author to really avoid this was Wodehouse - who simply wrote the same story 80 times!