The email from the landlord had the subject line: Below it, just three words: Don't. Just don't.

His first mistake was watching a YouTube tutorial titled "DIY Double Pane Repair in 10 Minutes!" The man in the video had a soothing voice and used a drill bit the size of a sewing needle. Easy, Leo thought. He drilled two tiny holes at the bottom corner of the outer frame. A faint hiss of humid, stale air escaped—the trapped breath of winters past. Then, he used a hairdryer to chase the fog away. For one glorious hour, the window was crystal clear.

For three days.

That night, he heard a tink. Like a distant wind chime, but wrong. He woke at 3:00 AM to find the window had turned into a kaleidoscope. A sprawling, fractal crack now bisected the inner pane, spreading from his drill holes like frozen lightning. The temperature had dropped twenty degrees, and the glass, in its desperation to breathe, had simply shattered its own heart.

He ignored the warning.

Leo nodded miserably.