Never too Late to Read Classics discussion

Last summer, four terrified friends made a desperate pact to conceal a shocking secret. But now, someone has learned the truth and is determined to get even.
The horror is starting again. There is an unknown avenger out there who is stalking them in a deadly game. Will he stop at terror-or is he out for revenge?

I read this at the end of November.
It was an okay little mystery, pretty young adult. Not much to say about it beyond that.

One very weird thing in my copy was that it was "updated" to mention cell phones, gps, and things for modern readers. But you could tell that you were reading the 1973 story. They were constantly calling each other on landlines, "turned the key and turned on the headlights" in a car, etc.