What's the Name of That Book??? discussion

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To the Vanishing Point
SOLVED: Adult Fiction
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SOLVED. Probably Horror, Adult possibly YA. The cover had a skeleton in a car in the desert. [s]
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The cover is what I remember the most. I think it was the view from the back seat of a car. In the driver's seat is a skeleton, zombie or otherwise dead/undead thing either looking back at you, or seen through the rear view mirror. The car was in the desert.
Given the cover, I'm assuming this was a horror book, but to be honest I can't remember the content of the book hardly at all.
I know this is vague, but I've spent a few hours plugging various keywords into Google image searches and I just can't find this book. Normally that works for me, but this time it just isn't.