My grandson came up from the basement pale and shaking. ‘Grandma, pack a bag. We’re leaving. Don’t call anyone.’ I was confused. ‘What’s wrong?’ ‘Please, just trust me.’ Twenty minutes later, my children were calling nonstop… ‘Don’t answer them!’

He swiped the screen and shoved it toward me. The photo was dark, taken with a flash in the crawlspace. I squinted. Pipes. Wires. A small black box with a digital timer attached to a copper line.

“I don’t understand what I’m looking at,” I said.

“Someone did this on purpose, Grandma,” he said, looking me dead in the eye. “That’s a timer connected to a bypass on your furnace exhaust. Someone rigged it to pump carbon monoxide into your bedroom at night.”

The air left my lungs.

“Pack your things,” he commanded softly. “Now.”

Twenty minutes later, we were in his beat-up Ford truck, speeding away from the house my late husband built with his own two hands. My phone started ringing in my purse.

Owen glanced at the screen. “Steven,” he read. “Don’t answer.”

“Why not? He’s your father. He worries.”

Owen didn’t answer. He just gripped the steering wheel harder and kept driving, his eyes fixed on the rearview mirror as if a ghost were chasing us.