Fiction is shelved alphabetically by author. Call numbers are FICTION and the first three letters of the author's last name.
For instance, Toni Morrison's novels are shelved under
FICTION MOR
If more than one author has the call number FICTION MOR, shelve them alphabetically by the author's last name:
Caitlin Moran Robert Morgan Toni Morrison
If an author has a series, try to shelve them in order of the series number.