a rec that I do not advise you to start at bedtime

Concession, a novella-length Iron Man (movieverse) story by obsession_inc, is the most unputdownable thing I've read in some time.

Christine Everhart does her job, in a chilling mystery/suspense plot that goes AU after the first movie. It is deftly constructed, sharply characterized, intelligent and disturbing and altogether believable in terms of the canon on which it draws. To say more would be to give away too much.