I'm trying not to be repulsed by the scent, because I love Frostbeard and the smell of old books. But this does not smell like old books. The cold throw provoked a sense of disgust, but I thought lighting it might reveal something that could explain why some people love this candle. Not so. Maybe this is the cilantro of candles: some people love it, and some people find it disgusting.
Some have mentioned smelling cucumber, others vanilla, other mold. Combine those three and you are probably on the right track.
And it is NOT as subtle as others have remarked. Once lit, the candle's scent pervades the space. You have to really, REALLY want to smell this scent to light this candle--no escaping the odor once it's lit.