Fire and Hemlock, Wynne Jones, Diana

A fantastic tale by the legendary Diana Wynne Jones--with an introduction by Garth Nix.
Polly Whittacker has two sets of memories. In the first, things are boringly normal; in the second, her life is entangled with the mysterious, complicated cellist Thomas Lynn. One day, the second set of memories overpowers the first, and Polly knows something is very wrong. Someone has been trying to make her forget Tom - whose life, she realizes, is at supernatural risk. Fire and Hemlock is a fantasy filled with sorcery and intrigue, magic and mystery - and a most unusual and satisfying love story.
Widely considered to be one of Diana Wynne Joness best novels, the Firebird edition of Fire and Hemlock features an introduction by the acclaimed Garth Nix - and an essay about the writing of the book by Jones herself