Shattered Echoes by B. A. Shapiro

A young widow is haunted by the past in this "fast paced . . . hauntingly original" thriller from the New York Times-bestselling author of The Art Forger (Mystery News).
After the tragic death of her husband of less than two years, Lindsey sells her house in the suburbs and moves into a renovated townhouse in the city, only to discover that an earlier tenant-over one hundred years earlier-apparently still lives on the premises. Lindsey wants to start over, but she is haunted by her past, by unfathomable guilt-and perhaps by a ghost.
Shattered Echoes is a psychological thriller about murder, madness, and the supernatural in Boston's historic Back Bay.