User blog comment:Corbierr/Izzy's writing advice/help service!/@comment-26176305-20150313165647/@comment-4816103-20150313184724

Hmm...well, first, think of your mystery. Ex. Classic murder mystery. Then, decide how it ends. Ex. Maybe hero finds out that their love interest was actually the killer. Now that you know the ending, it'll make it easier to add clues, red-herrings, and foreshadowing. Make sure the ending is interesting and make sure the mystery is important enough to keep people caring. Never reveal too much at once, be prepared with a lot of twists, and keep the villians one step ahead (if it's that sort of mystery).