She almost pressed it. But then the light in the corridor flickered—once, twice—and the door of #03-12 creaked. Not opened. Just creaked. As if someone on the other side had leaned against it.
“Ma’am, I’ve checked your flat’s sensor suite. All green. No malfunctions reported.”
The next day: Water flow anomaly in kitchen sink. 0.3L unexplained usage at 3:17 AM.
On Sunday night, she opened the app at 1 AM, unable to sleep. She tapped on the “Activity Timeline” feature, which aggregated all sensor data into a single graph. The past seven days showed a jagged line—her morning showers, her 6 PM cooking, her husband watching news at 9. But overlaid on that was a second, fainter line. A ghost line. hdb one view app
Her phone buzzed. A new notification: Pattern match found. This activity resembles historical data from Unit #03-12 (vacant since 2019). Suggested action: Report to HDB.
The bedroom door opened and closed. The kitchen tap ran for exactly 47 seconds. The bathroom exhaust fan turned on, then off. The main entrance never opened, which meant the visitor never left. They were inside the walls. Or inside the data.
Lina Koh had lived in Block 322, Ang Mo Kio Avenue 3, for twenty-three years. She knew its quirks: the lift on the right always smelled like durian on Sundays, the third-floor corridor light flickered in Morse code, and Mr. Raghavan from #08-12 watered his orchids so enthusiastically that it rained on the fifth-floor laundry below. She almost pressed it
She stared at the screen. The icon for Bedroom 2 turned from grey to a pulsing orange. Occupancy detected.
Lina did something she had never done before. She took the lift down to the third floor at 3:15 AM.
“I’m saying the app is detecting something . Whether that something is a sensor artefact, a data glitch, or something else… that’s above my pay grade. What I can tell you is this: do not press the Live Contact button. Whatever is on the other end, it has started responding.” Just creaked
“Hello, this is Lina Koh from Block 322, #09-12. I think there’s a sensor error in the HDB One View app. It’s showing movement in my flat when there’s no one there.”
The app gives her one last notification, delivered silently, in the dark: