I capped the cleanout, poured a bucket of water down every drain to test, and breathed for the first time in three hours.

I ran to the street and popped the cap off the cleanout —that white PVC pipe sticking out of the ground near the foundation. When I unscrewed the lid, dark water rose to the rim but didn’t overflow. Good. That meant the clog was downstream, between the house and the city main. If water had spewed out like a volcano, the clog would be inside the house—a much harder fix.

The first sign was a gurgle. Not from one toilet, but all of them. When I flushed the upstairs bathroom, the downstairs shower hissed back like a warning. Then came the smell—sulfur and decay drifting up from the basement drain.