More Lives: what if your dreams could come true?

The story of a typical teenager who has already decided how she wants her life to be. A loving husband, family and friends. No dark clouds on her horizon.
But Sarah Curtis has been having sad and confusing dreams, where she seems to be someone else. A girl with terrible, disturbing problems that could hold the secret to Sarah's future.
The dreams become more depressing, and Sarah is beginning to worry that something in her own life must be wrong. When a child goes missing, her life begins to mirror her dreams.
Her aunt takes her to Cornwall for a holiday, but her mind refuses to rest. Trouble seems to have followed her there, and a car accident leads to surgery whan a clot is discovered in her brain.
Could this be the cause of her nightmares?
previously published as More Lives Than One.