Minnesota Prairie Roots

THE “Mailbox Mysteries” SIGN POSTED in the front window of a downtown Cannon Falls insurance agency, drew my interest. I’ve always appreciated a good mystery and I wanted in.

So I headed to the nearby library, home base for the mysteries, to inquire about the featured Gangster’s Gold mystery. Within a week I received an introductory letter about notorious gangster and bootlegger Dutch Schultz and his $50 million treasure hidden somewhere in the Cannon River Valley.

Channeling my inner Nancy Drew, I determined to locate that treasure. If only my sleuthing skills matched my enthusiasm. Right from the start, I couldn’t figure out how to fold, and then use, a Tri-Hexa-Flexa-Coder to de-code a secret message. I needed help. My friend Stephani, who once considered becoming a private investigator but stuck to family genealogy, solved the folding/coding problem.

I realized solving this mystery would not be easy. Exactly as “Mailbox Mysteries” creator Matthew Stelter, Teen and Adult Services Librarian in Cannon Falls, likely intended. He created this interactive mystery series last winter as an outreach program for library patrons stuck at home during COVID-19 and, as he said, “tired of a life lived entirely through a computer screen.” At that time, the library building was closed to visitors. All of the clues for his mysteries are sent via US mail to the home-based investigators.

Eventually, Stelter crafted six mysteries—five for adults and a math-based set, “Postcard Puzzles,” for kids 12 and under. A bit overwhelmed by managing all of those mysteries, Stelter has since tweaked and downsized the “Mailbox Mysteries” to three.

His past experience developing escape rooms and murder mysteries shows in “Mailbox Mysteries.” I admire his ability to craft a fictional mystery rooted in facts with added local elements. He uses newspaper clippings, photos, letters, historical documents, maps, coded messages (he created the code for the challenging Hexa-Flexagon) and more in believable story lines.

A seemingly authentic newspaper article, for example, references the long-ago Fleckenstein Brewery in Faribault and a possible connection to the underworld. Turns out that story was pure fiction as is gangster and bootlegger Dutch Schultz’s connection to Minnesota. He never had ties here, although many gangsters did. Rather, he lived in New York, where his treasure is rumored to be hidden. Schultz died in a gang shoot-out.

In the end, I found the location of the $50 million treasure after hours of dissecting documents—yes, I became a bit obsessed—and using a magnifying glass to better view details on a map. Stelter rewarded me with a personalized Certificate of Commendation and advised me to bring a shovel to dig deep for the buried treasure.

Now I’m on to the next “Mailbox Mysteries,” Spy School. I’ve received my introductory letter, a brochure for the Vera Atkins Spy Academy and an encoded note warning that the school is compromised.

VASA happens to be in Faribault, as printed in a brochure so professionally done that I would think the academy really existed if I didn’t recognize the photos of Shattuck-St. Mary’s School. Stelter lived at Shattuck for 10 years. I’m also semi-familiar with the campus so I’ll see if that familiarity helps in solving the mystery. As in Gangster’s Gold, I expect this mystery writer to weave more local details into the fictional story line.

While I await the next set of clues, I invite you to join the team of private investigators. Stelter welcomes all Nancy Drew, Hardy Boys, Sherlock Holmes types to register by November 30. Simply email your request for Spy School along with your name and complete snail mail address to: mstelter (at) selco (dot) info

Be forewarned, though, that these mysteries are challenging and time-consuming. Yet so worth the satisfaction of solving and of reaching into your mailbox to find, not a bill, but rather the efforts of a talented and creative librarian.

The third “Mailbox Mysteries,” Cypher Cabin, will be available starting December 1.

Good luck, sleuths.

© Copyright 2021 Audrey Kletscher Helbling