It's a one-act show (which runs an hour and 45 minutes) that is oddly emotional by the end. The cumulative sadness sneaks up on you, and it lingers. It's hard to shake and even harder to pinpoint just why it's so heavy. That's a good thing. So many shows, even when they're enjoyable, are entirely forgettable a day or two later. The mournfulness of "The Secret In Their Wings" will haunt you.