Lisa Shilling is 16, smart, and attractive — and she is losing her mind. Some days are "light," and everything is normal; during her "dark" days, she hides deep within herself, and nothing can reach her. Her teachers ignore what is happening. Her parents deny it. Lisa's friends are the only ones who are listening, and they walk with her where adults fear to tread. This classic novel of a teenager's descent into madness, in the tradition of Go Ask Alice and I Never Promised You a Rose Garden, has remained a best seller for close to thirty years.