Wasn't that also the increasing problem with Tom Clancy's Jack Ryan novels until he did Red Rabbit as a prequel?
Yep, and
Teeth of the Tiger with Jack's son. Clancy wasn't able to really run with either approach, though; after
Teeth he gave up writing for a while before eventually handing the reins of his characters to Grant Blackwood.
Aha...NOW I know why I thought
Dead or Alive didn't measure up. I take it Blackwood did the vast majority of the writing?
It was truly a sad day to see
Against All Enemies being sold (the start of a new series, I think), and realize I didn't give a damn.
I mean, without spoilers, there was even a BIG character death I should've cared a lot more about, but in my opinion was handled badly. Basically, I was reading the book more as political commentary than I was for the characters. Not to mention that events involving the real-life inspiration for the Big Bad ended up happening within months of my finishing the book, which
also knocked my enthusiasm for another Ryan book to zero.
Damn shame, considering how much I liked Clancy's novels through
Teeth of the Tiger. I even consider the older Clancy novels (the Soviet-era ones) to be an inspiration to my own writing.
But if I had to point to where the series started getting weaker, I'd have to say
The Bear and the Dragon.
Rainbow Six at least held my attention all the way through, though I think after what happened in
Debt of Honor/
Executive Orders (talk about a scary predictive set of novels...), Clancy got himself into a position where it was going to be impossible to top himself. He should've saved that for the end; the result is that everything else simply doesn't measure up in comparison.