Help me find a book?

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I read a book about 10 or 11 years ago, but I'm pretty sure the book itself was older than that.
All I remember is this girl stayed at a lakehouse during the summer and there was a guy there but he was a ghost and his mom had murdered him and tried drowning the girl in the lake at the end. I guess it could have been an ocean but I'm 90% sure it was a lake.
Had a bit of lewd in it which was weird since I got it from the school library when I was in 5th or 6th grade...