Dark Angel — L.J. Smith

"CAR ME ANGEL" HE SAYS.

One winter day Gillian Lennox almost dies . . . and is saved by an angel. His hair is golden. His eyes are as violet as her own. And when Gillian comes back from her near-death experience, he comes with her. An invisible guardian that only Gillian can see, he whispers the secrets of popularity in her ear. Overnight, the once-shy Gillian becomes a sensation. David, the boy she has loved for years, notices her.

But then Angel begins to make bizarre demands. To draw Gillian into a world of risk and dark excitement. At last, she has to face the terrifying question: Who is Angel? What has she brought back from the Other Side? And can sill and David find out his secret before it's too late. . . ?