The cache is NOT at the listed coordinates. You're looking for a small-to-medium sized container.
N 41° 19.abc W 96° 02.def
To find abc, take the three digits from the original British title of the Miss Marple novel published in 1957, and add 15.
To find d, count the number of letters in the title of the Miss Marple novel published in 1971.
To find ef, take the total number of full-length Miss Marple novels (not short story collections), and add 13.
Miss Marple was created by Agatha Christie. First-to-find prize is a DVD-R with the eBook "The Body in the Library" in epub, Kindle and pdf formats, and 4 UK television films featuring Miss Marple in .avi format.
For more information and resources for puzzle caches by The WBs, click the "Related Web Page" link above.