Murder of a Bookman

In the tradition of the old "Ace Doubles" two-in-one books (flip one over to read the second title)--here is the fifth Wildside Mystery Double.
MURDER OF A BOOKMAN: A Bentley Hollow Collectibles Mystery Novel, by Gary Lovisi. When the police are asked to investigate the brutal murder of bookseller Brian MacDonald, who's been stabbed in the back with his letter opener, they have no trouble locating suspects, because MacDonald has been less than honest in his dealings. But Detective Bentley Hollow has problems of his own: his wife has left him, and he detests his new partner. Still, he has to find a solution to the crime, and when he does, his life will be irrevocably changed. The first in a new series. THE PAPERBACK SHOW MURDERS, by Robert Reginald. When bookdealer "Freddie the Cur" is murdered at a paperback show, Police Lt. Pfisch is forced to close the con. After all, this is the third untimely death of a show attendee in as many days. First there was Lissa Boaz, called the "Boa Constrictor" for her questionable business practices. Then came Brody Richard "The O-Man" Dameen, the drunken horror writer. What links these victims, other than collectible paperbacks? And why does the identification of the REAL author of an early Ace gothic even matter? A comic mystery novel of the modern con scene.