Barnes & NobleRemember Me (Remember Me Series #1) by Christopher Pike

In this harrowing thriller from bestselling author Christopher Pike, a teen girl must solve the mystery of her own murder before the killer strikes again. After a night spent out with friends, Shari Cooper wakes up in her bed not sure how she got home. And things only get stranger when her family acts like she's not even there. Nothing Shari says gets a response and nothing she does can get someone to even glance at her. Then the hospital calls. Shari's mom starts to cry. The blood drains from her dad's face. And still no one will tell her what's wrong. But when they arrive at the hospital, Shari follows her family to the morgue and sees herself lying there on a cold slab. She's dead. The police rule her death a suicide, but Shari knows she was murdered- and if the cops won't find her killer, she will. To investigate, Shari spies on her friends and even enters their dreams. There, she comes face to face with a nightmare from beyond the grave...the Shadow. The Shadow is even more horrible than death itself, but Shari must face it to uncover the truth about her death and prevent her murderer from killing again.