A woman dies by suicide in a red Cadillac on Christmas Eve, in the driveway of the only family that still speaks to her. That’s tragic enough, until they open a metal lockbox in her closet and find out “Lori Erica Ruff” was never real: she once stole the identity of a dead child, changed her name in a Texas courtroom, and spent decades hiding her past behind church events, a marriage, and a baby she guarded like a secret.