book page with additional data

I have a list of contestants, each in a book page for easy navigation. I want to add to the individual's page a list (title+teaser) of his recent posts (blog,stories, whatever).

I can get a list of ALL the posts (of all contestants), but how do I get the userid of the "currently viewed" contestant to make the connection ? Each contestant has a profile page as well; no prob to get the same data in his profile using the code in node 26478 (Custom user profile page with (x) latest weblog entries of that user). I cannot seem to port the code to do this on the book page.

Any ideas/suggestions/alternatives? Thanks