iPhone: How to get back deleted audiobook

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Hi,

I purchased and downloaded an audiobook on my iPhone recently. Later,m I synched my iPhone with iTunes. The audiobook stopped playing after that on my iPhone, it was still there but when I I clicked the play button the time didn't move and it just stayed at 0:00 seconds. Since it was (and still is) playing OK on the PC, I decided to delete it from my iPhone to try and re-sync and see whether this resolves the issue. But now I am unable to get it back on my iPhone. It still appears in the audiobooks and purchased folders and plays ok on the pc. I've tried synching itunes with my iPhone with the audiobook file checked in the list, but it still doesn't appear on my iPhone. Does anyone know how I can get it back onto the iPhone?

Thanks