A notorious mafia boss had spent more than three million dollars trying to discover why his twin sons were growing weaker, yet every specialist he hired offered different theories without any clear answers.

I stood outside the hospital doors in the cold night air, the smell of sterile scrub-wash and car exhaust filling my lungs. I closed my eyes, taking a deep, clean breath.

The most dangerous poisons in this world don’t come with skull-and-crossbones labels. They don’t arrive with the bitter smell of rot or the choking sting of smoke. Sometimes, they come wrapped in sleek plastic housings, promising luxury and clean air, disguised as the sweetest scent in the world, hiding silently in the spaces between the walls.