Pretend You Don't See Her by Mary Higgins Clark
What happens when a young woman is accidentally caught up in a dangerous murder investigation, having merely been in the wrong place at the wrong time? Lacey Farrell, a rising star on the Manhattan real estate scene, is witness to a murder - and to the final words of the victim. The dying woman is convinced her attacker was after her dead daughter's journal, which Lacey gives to the police, but not before making a copy for herself. It's an impulse that later proves nearly fatal. Placed in the witness protection programme and sent to live in Minneapolis, Lacey must assume a fake identity, at least until the killer can be brought to trial. There she meets Tom Lynch, a radio talk-show host whom she tentatively begins to date - until the strain of her deception makes her break it off. Then she discovers the killer has traced her whereabouts. Armed with nothing more than her own courage and clues from the journal, Lacey heads back to New York determined to uncover who is behind the deaths of the two women... before she is the next casualty.