A huge cloud of secrecy is surrounding an upcoming night out in Sioux Falls.

The State Theatre downtown is showing their annual 'Mystery Movie', Monday (April 1) at 7:00 PM. And this is no April Fool's joke.

They're playing things very close to the vest promising 'No Hints. No Clues. No Refunds.

That isn't completely true. The State Theatre has given us a few very vague tidbits to chew on.

We know the film was released sometime after 1980, runs about two hours, and is rated R.

Other than that, your guess is as good as mine.

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So what film do you think it is?

Head to our Facebook page and leave a comment.

If you're feeling adventurous, you can buy a ticket for $9.50 and find out for yourself.

35 Movies That Take Place in South Dakota

When it comes to South Dakota and Hollywood, we've seen our fair share of films that have used our state as the backdrop for a number of productions over the years. They may not have always filmed here, but movie folk love to set stories here.

We're all familiar with the blockbusters like 1990's Dances With Wolves, 1959's North By Northwest, and more recently, 2007's National Treasure: Book of Secrets. But our state's life on the big screen goes back nearly 100 years.

According to IMDb, it all started with Courtin' Wildcats, a 1929 film which, like so many of the 29 films on this list, is a Western set in the time before South Dakota became a state in 1889.

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