I leave the comfort of the heated car and take the two fishing-tackle boxes I use for a crime kit from the trunk.

Valtteri wades toward me through the snow. It’s deep, frozen hard on the surface but powdery underneath, and trudging through it makes him lurch until he reaches the driveway. “Don’t go over there yet,” he says.

“Is it that bad?”

“Just take a second and brace yourself.”

Valtteri is a devout Laestadian and to my mind overobsessed with his strict, revivalist version of Lutheranism, but he’s a good man and a good officer. If having eight kids and going to church every Sunday and most evenings makes him happy, it’s okay by me. I turn on a flashlight and start toward the crime scene.

When I get about five yards away, I see a naked corpse embedded in the snow. I’m certain it’s Sufia Elmi. When I see what’s been done to her, I understand why Valtteri warned me. I’ve investigated more than a few homicides, but never seen anything so cruel. I set down the fishing-tackle boxes and take a moment to steady myself.

Judging by the indentations in the snow, it looks like the killer parked, then either dragged Sufia or forced her to crawl away from the car. The snow is about three feet deep and she’s sunk about half that distance into it. She managed to thrash enough to make a snow angel. Her black body is ensconced in white snow stained with red blood. In places, blood has spattered and sprayed two yards away from her. Her corpse is starting to cool, and silver frost is forming on her dark skin, making it shimmer.

A car pulls off the road and I figure it’s Esko the coroner. The responding officers, Antti and Jussi, are standing there shivering, even though, like me, they have on heavy winter field uniforms and thick hats and gloves. They’re looking useless and might pollute the crime scene tramping around, moving to keep warm. I tell Jussi to walk back up to where the driveway meets the road and look for discarded evidence. If there is any, it will be easy to find with the glare of his flashlight on unbroken snow.

Antti is our best artist. I take graph paper and a pencil from a tackle box and tell him to make sketches of the crime scene, not an easy task in this bitter cold. He puts chemical hand warmers inside his gloves to keep his fingers from getting stiff and starts drawing.

Esko comes over and nods hello, doesn’t speak. I tell him to take a look around.

I get two cameras out of the tackle boxes, one film and one digital, a couple external flash units and a tape recorder. Winter here is an endless night, but the snow reflects what little light there is and casts everything a dim murky gray. I use a Leica M3 to shoot film photos of the surroundings. Old Leicas are well made and don’t use batteries, so they almost never fail because of cold-weather conditions.

Snow photography isn’t easy. If you use lights or flashes at more than a forty-five-degree angle, everything disappears in the glare. It has to be done with polarizing filters and lights at the level of the snow. I give the cameras to Valtteri. “You know what to do, right?” I ask.

Valtteri nods, starts setting up the external flash units. “I was going to take my boys deer hunting tomorrow,” he says. “Now I don’t think I have the stomach for it.”

I wouldn’t either.