Eight perfect murders

"Years ago, bookseller and mystery aficionado Malcolm Kershaw compiled a list of the genre's most unsolvable murders, those that are almost impossible to crack--which he titled 'Eight Perfect Murders'--chosen from among the best of the best . . . But no one is more surprised than Mal, now the owner of the Old Devils Bookstore in Boston, when an FBI agent comes knocking on his door one snowy day in February. She's looking for information about a series of unsolved murders that look eerily similar to the killings on Mal's old list. And the FBI agent isn't the only one interested in this bookseller who spends almost every night at home reading. There is [a] killer out there, watching his every move . . . To protect himself, Mal begins looking into possible suspects . . . But Mal doesn't count on the investigation leaving a trail of death in its wake. Suddenly, a series of shocking twists leaves more victims dead--and the noose around Mal's neck grows so tight he might never escape"--Amazon.