Answer:

ERLE

Answer	Crossword Clue
ERLE	Agatha's contemporary
ERLE	First name in detective fiction
ERLE	First name in mysteries

ERLE	Perry's creator
ERLE	Perry's penner
ERLE	.. Stanley Gardner
ERLE	Author Gardner
ERLE	Della's creator
ERLE	First name in mystery writing
ERLE	Middle name of a detective novelist
ERLE	Mrs. Gardner's boy?

ERLE	A. A. Fair's given name
ERLE	Agatha's colleague
ERLE	Gardner of mystery
ERLE	Mason's Gardner?
ERLE	Perry's Gardner
ERLE	First name in Perry Mason-creating
ERLE	Agatha colleague
ERLE	A Gardner

ERLE	Mr. Gardner
ERLE	Gardner
ERLE	... Stanley Gardner
ERLE	Gardner's first name
ERLE	Writer Gardner
ERLE	Lawyer Perry's creator
ERLE	First name in whodunits
ERLE	Forename in whodunits

ERLE	Creator of Perry
ERLE	Gardner of crime fiction
ERLE	Creator of Della and Perry
ERLE	First name in courtroom fiction
ERLE	First name in courtroom drama
ERLE	Creator of Perry and Della
ERLE	Perry Mason's creator Gardner
ERLE	Contemporary of Rex and Ngaio

ERLE	Crime fiction name
ERLE	Writer ... Stanley Gardner
ERLE	Author .. Stanley Gardner
ERLE	Mystery first name
ERLE	First name in trial literature