Secret Admirer is a novella written by R. L. Stine. It was first published in 1996 and was the thirty-sixth book in the Fear Street book series.
Description[]
Selena has it all. She just scored the lead in her high school play, and everyone adores her. So when she starts receiving dead flowers from a secret "admirer" named The Sun, she just assumes it's a harmless fan.
But Selena soon realizes that The Sun is serious...dead serious. First, her understudy is injured in a suspicious accident. Then, a speeding car almost kills her! Selena doesn't know what this psycho wants.... All she knows is that her number-one fan has become her number-one nightmare.