My Printer Started Printing Maps of My House

At 3:06 in the morning, my printer turned itself on and printed a floor plan of my house.

I lived alone in a townhouse in Fort Collins, Colorado, and worked remotely as a GIS technician. My second bedroom was my office, so I had the usual collection of electronics in there: a wireless printer, my work computer, a router, and a robot vacuum that mapped the house as it cleaned.

The page that woke me up was sitting halfway out of the printer when I walked into the office.

It was crude, but unmistakable.

Kitchen.

Stairs.

Office.

Bedroom.

Someone had drawn the basic layout of my townhouse.

There was also a red square over the patio door.

My first thought was that someone from work had accidentally sent something to my printer. I deal with maps for a living, so it wasn't completely impossible.

I sent a picture to our IT department the next morning.

They checked.

Nothing had been sent through our system.

I changed my Wi-Fi password and unplugged the printer.

For two days, nothing happened.

Then I needed to scan a receipt.

I plugged the printer back in.

Before I even touched the controls, it started printing.

The second map was much better.

It showed my couch.

My dining table.

The desk in my office.

It even showed a dotted line leading from my bedroom downstairs to the coffee maker.

Two red circles had been drawn around the ground-floor windows.

That was when I called the police.

There wasn't much they could do.

Nobody had entered the house. Nothing had been stolen. There were no damaged locks or footprints.

They told me to document anything unusual and secure my network.

Then a third page printed.

This one scared me more than the others.

Beside the upstairs bedroom was:

7:42 — LEAVES

A line followed the exact route I normally took downstairs in the morning.

Bedroom.

Bathroom.

Kitchen.

Front door.

Someone wasn't just mapping the house.

They were mapping me.

I opened my router settings and started checking connected devices.

There was one I didn't recognize.

It was connected to an old guest network I'd created months earlier for friends and completely forgotten about.

The device name was generic enough to mean nothing.

What caught my attention was the signal strength.

It would suddenly become strong.

Then weak.

Then disappear.

Over the next few hours, I realized something else.

Whenever the connection became strong, there was usually a dark SUV parked across the street.

When the SUV left, the device disappeared.

I gave that information to the police.

They found the vehicle once, but there wasn't enough evidence at that point to search it.

So I started documenting everything.

That's when I discovered how much information my robot vacuum had actually collected.

I had always thought of it as a dumb appliance that knew where the furniture was.

It wasn't.

Its app contained a detailed map of the house.

Its obstacle camera had also captured images while navigating around furniture.

My account history showed a login from a device I didn't recognize.

Someone had accessed it.

They had my floor plan.

They had images from inside the house.

They could see where the furniture was.

And apparently, they knew when I usually left for work.

That night, I disconnected the townhouse from the internet.

Router off.

Guest network gone.

Printer still plugged in, but no Wi-Fi.

I put the printer on the floor beside me and waited.

At 1:20 a.m., its wireless indicator suddenly lit up.

The dark SUV was across the street.

Then the printer started.

A single sheet came out.

It showed my front door.

A black arrow pointed inward.

I called the police immediately.

Officers arrived before the SUV could leave.

The driver told them he was waiting for someone.

Eventually, investigators got enough evidence for a warrant.

They found several laptops in his possession.

One of them contained copies of the maps my printer had produced.

It also contained images downloaded from my robot vacuum.

But mine wasn't the only house.

There were files from six different homes.

Police determined that he had obtained compromised smart-home credentials and looked for houses where only one person appeared to live.

He used unsecured or forgotten guest networks whenever possible.

The maps weren't meant to scare people.

They were reconnaissance.

He was learning entrances, windows, room layouts and daily routines before physically approaching the houses.

There was one folder on his computer called:

CONFIRMATION

Inside were photographs taken after each set of maps had been sent.

They were apparently used to confirm that the person still lived there and that the house layout matched the data.

There were several pictures of my townhouse.

One showed my kitchen window.

Another showed the patio door.

Then police showed me the last one.

It was me.

I was standing in my upstairs office holding the second map the printer had produced.

The photograph had been taken through the window.

But the angle was wrong for someone standing on the street.

The police checked the property.

The only place that angle made sense from was inside my fenced patio.

So sometime after sending me those maps, he hadn't just been watching from his SUV.

He had already crossed the fence.

He had already been standing against my house.

And while I was staring at a piece of paper trying to figure out how someone knew the layout of my home...

he was outside taking a picture of me reading it.

If you prefer narrated horror, there’s an audio version of this story on TRIFILIM. You can find the channel through my profile.