Perhaps try converting an ePub version? Sometimes if people don't attach the NCX just right in the OPF, then Kindlers end up with no flickable chapter marks in the ensuing Mobi, even if they're done correctly in the ePub. Of course, if no form of TOC, ncx or html, exists in the book to begin with, then that's another problem.
Now also free @
Christian Book (available worldwide). Sony's price-updating bobble-birds have set it at $1.99 but may randomly make it free later.