Blood Detective,Waddell, Dan torrent

In Dan Waddell’s exemplary debut, genealogist Nigel Barnes is recruited by Scotland Yard to investigate a group of puzzling, vicious murders. The victims all bear a message carved into their bodies that appears to refer to a series of 19th-century stabbings for which the killer may have been innocent. “A fascinating and original investigation into the dark roots of our family trees.”—Val McDermid, best-selling author