The New England suspense author's (Blind Spot; See No Evil; etc.) first venture into hardcover fiction blends several themes and genres into a mélange that may have a difficult time finding an audience. Shapiro gives the reader a bit of mystery, a bit of romance, a ghost story and social history both contemporary and pre–Civil War. The diary of Sarah Harden provides insight into the courage, convictions and trials endured by Underground Railroad sympathizers in Lexington, Mass., while a parallel story marks the progress (or lack of) that haunts Lee Seymour, a descendant of the Hardens, a proud abolitionist family. As Sarah's diary reveals details of the tragic love that developed between her and a runaway slave, Silas Person, in the late 1850s, Lee is busy helping her grandmother oversee the paperwork, repairs and reconstruction necessary to have Harden House made part of the Harriet Tubman Network to Freedom National Park. Assisting Lee is Trina Collins, a recovering addict from the Cambridge rehabilitation center where Lee works, SafeHaven. Activities both ghostly and human affect the progress being made on Harden House, and the violent past hidden for more than 100 years seems to have given birth to a new cycle of violence. An effective writer, Shapiro handles the strains of her story quite well, though her reliance on the paranormal aspects of her plot may not appeal to mystery purists. Agent, Nancy Yost. (Apr.)