http://www.newmysteries.org/submission_guidelines/

NO ENTRY FEE
Discovering New Mysteries is now accepting submissions of original plays, screenplays, teleplays, and short stories for both adult and youth audiences. Deadline for submissions is August 30, 2009. A panel of professional readers will blindly review the submissions and narrow the field to the final mysteries, who- dunnits, cops-n-robbers, courtroom dramas, thrillers, suspense or adventures. Nearly $20,000 in cash prizes for winners + prestigious Angie Awards.