I'm currently reading Doorway to Murder by Carol Pouliot. This book is the first in the Blackwell and Watson Time-Travel Mystery series.
Detective Sergeant Steven Blackwell is called in when the Vice-President of the First National Bank and Trust Company is found murdered in his vault. What could Leo Castleman have been doing there, especially with a blizzard raging outside? As Blackwell begins to work the case he notices something strange in his house-the figure of a woman. Thinking he must be working too hard he shrugs it off. But every night he sees her. Then one night, she speaks.