This is the fourth and final episode of “The Rules Are Different Here,” a four-part series on mass incarceration in New Hampshire. Listen to the full series here. Annie Wrenn is middle-aged with blond hair she wears with bangs. She’s a little over 5 feet tall. And on first sight, you’d never guess she’s a prison guard. “One of our nicknames is floorwalker because that’s what we do we walk the floors of the prison. Cell to cell, unit to unit, tier to tier, however you wanna explain what the living quarters are like,” says Wrenn. She’s currently a correctional officer at the Men’s State Prison in Concord, a job she’s had for 17 years. “And there are the dangerous parts too, like cell extraction, and dealing with inmate fighting, or arguments. You know sometimes even staff arguments you have to deal with,” Wrenn says. “It’s endless. It’s endless what we do.” It’s also something she never expected she would do. As a single mom looking for work, she saw an ad for officers in the paper. The