Fear Street #38: The Confession by R.L. Stine [1996 PAPERBACK]
The Confession by R.L. Stine [FEAR STREET #38]
FIRST PAPERBACK PRINTING  ARCHWAY
Book is like new and unread.
Five close friends... One murderer.
Julie's friends couldn't stand Al. In fact, they all wished Al were dead. But that doesn't mean one of them killed him. Julie knows her friends. She knows they're innocent...until one of them confesses to the murder.
Julie and her friends make a pact to keep the killer's secret. They're sure it was a one-time thing. It will never happen again.