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

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Cruel Summer
SOLVED: Children's/YA
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SOLVED. YA Murder Mystery based in Europe summer holiday. Read 2014-2018. Spoilers. [s]
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Plot a group of 6 friends both male and female holiday in Europe they haven’t seen each other in a long time. One by one they are murdered
The scene is set in an isolated villa on top of a cliff with a pool overlooking the ocean. Steps from the house lead down to an isolated beach with a dock and rowboat.
Specific scene I remember from the book in chronological order (to the best of my memory)
“She always looks like a model and never seen without stilettos, when she takes her heels off she walks around on her tiptoes.”
“She’s face down in the pool the water is tinged red with blood a broken wine bottle on the pool side with shards of glass in the pool”
“We wrap her up in blankets and weigh it down with rocks we head down the steps and climb into the rowboat. When we row out of the bay we throw her body overboard and watch it sink”
Towards the end of the book A person is tied up under the house with their mouth taped there’s three people still alive and the murderer is in love with one of the friends and that’s why they kill the others. The murderer ends up dying I think the main character hits them in the head with a rock. the police come at the end of the book no one is charged.
I found it on google books a few years ago but I can’t find it now