Terrance Winter, a writer for The Sopranos, has a ready answer when asked about the most frequent fan question he fields — hands down, it’s about the episode with the missing Russian. What happened to the Russian?!
If you’ve seen the series, you know what I’m talking about. The episode, called Pine Barrens, features a botched execution of a Russian thug and his subsequent mysterious disappearance into the frozen wilderness of New Jersey. Neither the Russian nor his would-be corpse makes any other appearance in the series, and the mystery surrounding his whereabouts is never solved. It drives people bananas. Series creator David Chase had this to say about the episode:
This is what Hollywood has done to America. Do you have to have closure on every little thing? Isn’t there any mystery in the world? It’s a murky world out there. It’s a murky life these guys lead. 
Part of me loves this mystery. But that part is infinitesimally tiny compared to the part of me that feels that the NOT KNOWING is an unscratchable itch that will preoccupy my psyche until kingdom come.
I had reason to revisit my hatred for loose threads recently because I experienced the unparalleled joy of tying off a thread that has been dangling for the better part of thirty years. When I was in fifth grade, my best friend moved away. This was back when long distance phone calls were expensive and when the internet was still only a gleam in Al Gore’s eye. My friend and I exchanged letters for a few months, but quickly lost touch. I’ve often wondered about her over the years, but web stalking never turned up any clues to her whereabouts. Recently, though, I happened upon her mother’s Facebook page, which led me back to her. Thanks, Evil, Personal-Data-Stealing Corporation! My childhood friend is happily married, owns a powerboat, and seemed only mildly disturbed by my decades-long obsession with finding her.
As a writer, I am torn by the same impulse that led Chase and Winter to craft a messy ending for the Pine Barrens episode. I’ve written before about the unanswered questions in the Lindsay Harding series. My latest book will (I hope) be the start of a new middle-grade adventure series set in Scotland, and my initial draft left many questions unanswered. Life, after all, is a tangled ball of loose threads that dwarfs the biggest twine balls in Kansas, Minnesota, Wisconsin, and Missouri. You hear that, Midwestern states? Your balls are not as big as you think.
I’m also a reader, though. With the help of a kindly literary agent, I realized that the initial ending I wrote was unsatisfactory, especially for a middle-grade audience. Readers needed more answers than I had given. As I polish this new draft, I’m trying to strike the right balance of resolution and continuing mystery. It turns out that resolution is as easy as killing a Russian in the Pine Barrens, which is to say not very easy at all. Wish me luck!