What did the letter to The Grapavine say?

Laurie goes to the publications office to work on the newspaper. When she gets there, she finds that someone has slid a mysterious note under the door. It is unsigned. The author of the note explains that he wants his story to be published in The Grapevine, but he doesn’t want his name attached to it. The letter-writer is a junior. He writes that a senior from Mr. Ross’s class invited him to join The Wave. When the letter-writer didn’t want to join, the senior threatened that the letter-writer would lose all his friends if he didn’t join. He also said that if the letter-writer didn’t join soon, it might be too late. Laurie is disturbed by the note.