When Bruce Patman complins that things at Sweet Valley High have gotten too boring, Jessica Wakefield agrees. Then Bruce starts a secret club to liven things up. Soon Club X has Sweet Valley High roaring with unscheduled fire drills and other practical jokes. But when Jessica joins the club, events take a dangerous turn.
Furious that a girl had the guts to join, Bruce dares Jessica to perform more and more dangerous stunts, hoping to scare her away. Jessica's twin sister, Elizabeth, urges her to stop before things get out of control, but Jessica has to show Bruce that she can do anything - even though it may mean risking her life.

Being up on the driving platform during the day was one thing. But at night, in the darkness and silence, it was a completely different experiance. It was scary and exciting at the same tim. Jessica recognized the sensation with a shock - it was almost the same feeling she had when her boyfriend, Sam Woodruff, kissed her. It was a delicious, exhilarating feeling.
Slowly, Jessica walked to the end of the board. She knew that when she dove there would be no way to judge how soon she would hit the water. She would meet it's cold surface without warning. She paused.
"Two ways down, Jessica," Bruce called. "You can always go back down the ladder."
"No way," Jessica called out.
Then, she quickly raised her arms over head, and dove out into the darkness.
Almost immediately, she hit the water and plunged down deep. By instinct, Jessica bent her body upward and kicked. In a moment, she reached the surface of the water. Then she climbed out of the pool.
Jessica stood dripping by the edge of the pool. She felt a satisfying surge of success. Now she knew she could create the danger and control the fear. At the moment she felt that there was nothing she couldn't do.
"Bruce, you should never, never, nerver underestimate me," she called out to where he stood in the dark.

Will the teen hot line lead to love for someone at Sweet Valley High? My Best Friends Boyfriend