This essay originally appeared on the My Journey Back blog on June 16, 2020 .

 I’m Elaine Cumberfield, a so-called minor character who appears in most of Mary Feliz’s six Maggie McDonald Mysteries. But I’d advise you never to underestimate me or any other “minor” character. We may be mere window dressing. More likely, we’re the pivots on which the plot will turn.

 Mary has described me as looking like the model for the Good Witch of the North and my Westie mailbox as “clever and cute—just shy of cutesy.” In her imagination, I look much like English actress Phyllida Law, but I prefer to think I’m my own woman. I wear gentle colors like lavender, periwinkle blue, and heather gray to set off my soft white cloud of hair. I bake custom cookies decorated in cheeky ways to tease my friends. For example, when my friend hurt his foot and was laid up for a while, I broke the foot off all the gingerbread cookies I baked for him.

 You could underestimate me, but I don’t recommend it. Almost every mystery employs a character like me. If we’re on the side of right and justice, the bad guys underestimate us, and it trips them up–every time. If we’re on the dark side, the protagonists almost always overlook us only to face dire peril. My investigative techniques could have molded strategy for the likes of Miss Marple or Columbo. I’m a time-honored trope, especially in cozy mysteries.

 Before I met Maggie McDonald, I taught, ending my career as a successful and well-liked middle school principal, so I’m no pushover. From that experience, I know it’s the “minor characters” you have to watch out for. What’s going on with the kids on the fringes that no one notices? A principal who ignores them won’t be around long.

 The same goes for characters in the fictional realm. In English Country House mysteries, readers must be wary of the servants, who are often invisible amid the dramatic angst of the upper crust. Conan Doyle uses Sherlock Holmes’s Baker Street Irregulars to get information from people who wouldn’t trust him. In Christie’s And Then There Were None, you can’t even trust the corpses to behave.

 So which characters should you suspect in Mary Feliz’s new book, Snowed In? All of them. I’m not in this book, so even knowing I’m on Team Maggie won’t help you. Don’t overlook anyone. As far as you know, nothing is as it appears.

 What kinds of characters are likely to fool you in mysteries? Do you like being able to solve the mystery or do you prefer to remain guessing until the great reveal?