Who wrote the longest running series for books?
Terry Pratchett
Agatha Christie
Agatha Christie
Agatha Christie
Agatha Christie
Agatha Christie
J. K. Rowling
Agatha Christie
C. J. Cherryh
Flannery O'Connor
J.K. Rowling
Agatha Christie
Dame Agatha Christie
Flannery O'Connor
Ian Fleming
Agatha Christie
J. K. Rowling
Dame Agatha Christie
Flannery O'Connor
Ian Fleming
C. J. Cherryh
Agatha Christie
Astrid Lindgren
L. J. Smith
Flannery O'Connor
Ian Fleming
Agatha Christie.
J.K. Rowling
Dame Agatha Christie
Anthony Horowitz
Agatha Christie
Astrid Lindgren
George R. R. Martin
Ian Fleming
J. K. Rowling
Flannery O'Connor
Dame Agatha Christie
Anthony Horowitz
C. J. Cherryh
Agatha Christie.
Agatha Christie
Isaac Asimov
Harry Turtledove
Ian Fleming
George R. R. Martin
Flannery O'Connor
Anthony Horowitz
Gene Roddenberry
J.K. Rowling
Agatha Christie
Erle Stanley Gardner
Dame Agatha Christie
J. K. Rowling.
L. Frank Baum
Agatha Christie's
Ian Fleming
John Bellairs
Agatha Christie,
Harry Turtledove
Agatha Christie.
George R. R. Martin
J. R. R. Martin
Anthony Horowitz
Flannery O'Connor
Gene Roddenberry
J. K. Rowling
C. J. Cherryh
Erle Stanley Gardner
Agatha Christie
Ian Fleming
Agatha Christie's
John Bellairs
Agatha Christie,
Dame Agatha Christie
Anthony Horowitz
L. Frank Baum
Harry Turtledove
Flannery O'Connor
Agatha Christie.
Gene Roddenberry
George R. R. Martin
Selden Edwards
Erle Stanley Gardner
Flannery O'Connor,
Jill Mansell
Agatha Christie
J.K. Rowling
John Bellairs
Ian Fleming
Agatha Christie's
Anthony Horowitz
Harry Turtledove
Agatha Christie,
Flannery O'Connor
J.K Rowling
Flannery O'Connor.
L. Frank Baum
Dame Agatha Christie
Flannery O'Connor,
Agatha Christie.
Selden Edwards
C. J. Cherryh
Agatha Christie
J. K. Rowling
Jill Mansell
George R. R. Martin
Selwyn Jepson
John Bellairs
Robert Jordan
Anthony Horowitz
Harry Turtledove
Ian Fleming
Agatha Christie's
Agatha Christie,
Selden Edwards
Flannery O'Connor.
Flannery O'Connor,
J.K Rowling
Agatha Christie
Robert Jordan
Agatha Christie.
Selwyn Jepson
George R. R. Donaldson
Selwyn Jephcott
Jill Mansell
Erin Hunter
George R. R. Lawson
John Bellairs
Harry Turtledove
Nancy Drew
Anthony Horowitz
Agatha Christie's
Agatha Christie,
Robert Jordan
C. J. Cherryh
Flannery O'Connor.
George R. Steinbrenner
Flannery O'Connor,
Agatha Christie
George R. Stewart
J. K. Rowling
Selwyn Jepson
Erin Hunter
Selwyn Jephcott
Jill Mansell
L. Frank Baum
Nancy Drew
Harry Turtledove
Agatha Christie.
Jill Paton Walsh
Agatha Christie of England
Harry Potter
J.K Rowling
John Bellairs
Robert Jordan
George R. R. Donaldson
George Eliot
Agatha Christie's
George R. R. Lawson
Agatha Christie,
Agatha Christie
George R. Steinbrenner
George R. Stewart
Erin Hunter
Nancy Drew
George R. R. Sims
Flannery O'Connor.
Harry Potter
Jill Mansell
Selwyn Jephcott
Agatha Christie.
Flannery O'Connor,
Robert Jordan
Agatha Christie of England
George R. Steiner
George R. Sims
George R. R. Stewart
John Bellairs
Harry Turtledove
J.K Rowling
Selwyn Jepsen
Nancy Drew
Flannery O’Connor
Agatha Christie's
Harry Potter
Richard Paul Evans
Agatha Christie
George R. Stewart
George R. R. Donaldson
Agatha Christie,
George R. R. Lawson
Robert Jordan
George R. R. Brooks
Flannery O'Connor.
George R. R. Stone
Jill Mansell
Anne Rice
Agatha Christie.
George R. Steiner
Flannery O'Brien
Agatha Christie of England