The listing, In Her Blood by Gayle Trent writing as GV Trent has ended.
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From Amazon:
Alexandra McCormick's great-grandmother was a brutal serial killer in the early 1900's. With her mother currently serving time in prison for murdering Alexandra's stepfather, Alexandra decides to do her college research paper on whether or not the tendency to commit murder or other violent crimes may be passed on genetically.
Her research takes her to Savannah, Georgia, a city built upon its dead. There, she meets Chad Greenway, whose ancestor is Alice Riley, the first woman hanged in the state of Georgia. Alice was hanged for killing her abusive master. As a freelance writer, Chad agrees to help Alexandra with her research provided he can write a story about her quest. Chad introduces Alexandra to David "Dumpster" Jackson, an unconventional psychologist living in a homeless shelter. Dumpster's mother comes from a long line of Geechee (a form of voodoo) practitioners, and she sees a darkness surrounding Alexandra.
Soon it seems everyone Alexandra meets winds up murdered.