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

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The Sinner
SOLVED: Adult Fiction
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SOLVED. Adult psychological thriller written within last 3 years, a woman on vacation at lake kills a man. [s]
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According to her, she thinks it has a white cover and the author is male and has a European/German sounding name.
The plot points that she can remember: A woman is on vacation at a lake with her son and husband. She kills a man out of the blue. As she is being investigated for the murder it turns out this man did something to her sister at a party years ago, and she had repressed the memory.
This isn't one that I've read, so I'm hoping the hive mind will be able to help. I thank you in advance!
Mary