Do you have a secret (or not secret) hankering to be a mystery writer? Check out the Washington Post "Sunday Source" section’s ongoing thriller. Readers are invited to fill in the storyline, which starts out with an appropriate number of hard-boiled characters and sticky complications.
What have you got to lose?; part of the criteria for the 300-word submission is “coherence.” Surely we can manage that!
Details are here (registration required).