What She Witnessed is the ultimate evil mother-in-law story. Some people may find their in-laws annoying or just not get along with them, but Kelly, the protagonist in this story, takes the cake with having the most horrible mother-in-law. What She Witnessed was an interesting thriller mystery. It kept my attention and I thought that the story was pretty unique. However, the writing itself was not great and a lot of the dialogue came across as cheesy. If the characters had seemed more realistic, I would have probably given this title a higher rating. 
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(I received an audio recording of this book from NetGalley in exchange for an honest review. All opinions expressed above are my own.)