Cold Wind (Joe Pickett 11) by C.J. Box
Used mass market paperback (cover may differ).
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A body hangs from a wind turbine, a bullet hole in his chest: Earl Alden, millionaire property developer. His wife, Missy, is the prime suspect. It wouldn't be a problem for Joe Pickett, if Missy weren't his mother-in-law.
Missy claims she's innocent, and for his wife's sake, Joe would like to believe her... but all the early signs point to her being as guilty as sin.
With his wife on one side and the law on the other, Joe needs to get to the truth before his family is ripped apart.