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

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The Kult
SOLVED: Adult Fiction
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SOLVED. Mystery, serial killer thriller. A serial killer named ORACLE hunts down five close friends after they frame him for their own murder. [s]
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Protagonist and his four friends are close from childhood. They have joined together as a team to protect each other from bullies in school. Their friendship continues till now.
I have read the summary one year back. was planning to read it but forgot the title. Trying so hard to find its title. Thanks in advance