[bigpallooka]

I thought the OP's question was simply phrased (unless the question was edited between your answers and my reading of the thread). The question wasn't how to combine pdf files into a single file or how to convert the multiple pdf's into an ebook with unbroken bookmarks. The question was how to make calibre recognise a folder or directory as a single book. Can it be done without manipulating the actual files with calibre's conversion facility or a third party application? I actually have the same issue with an encyclopaedia.


PS. If it's not possible I have PDFTK Builder Portable in my portableapps.com suite and will have to sacrifice the bookmarks. I don't have Adobe Acrobat so there isn't any option other than the series solution mentioned