Alive or Dead? (Book One in the Time Lady Awakened Saga)

The Survivor was born into High Gallifreyan society, treated like a princess, but gave it up to marry the Doctor and to run with him throughout time and space.

They were seperated as the Time War broke out. Her ninth incarnation died at the edge of Gallifrey's destruction and regenerated into an infant. She left a note to the Doctor to turn her into a human and hide her on Earth. There, in 1986 London, a nurse on her first day switched her with another baby girl. She was taken in by Pete and Jacqueline Tyler and renamed Rose Marion Tyler.

Nineteen years later, Rose is blissfully unaware of her Time Lady lineage until that day in the basement of the department store when the Doctor grabs her hand and whispers, "Run."

With the TARDIS seemingly calling to her, she joins up with the Doctor and begins to solve the mystery of her past... but it seems to be a locket that had been with her since she was born that could solve it for her.