You can’t see the border of the Cambio, but you always know when you’ve stepped across it. It starts as a chill flickering up your spine, and then it spreads out. Your arms and legs tremble, and sometimes you drop what you’re carrying. Then, there’s a mighty squeeze in the pit of your stomach, and a flare of heartburn pushing up through your throat. Then, suddenly, there’s a fizzy, weightless dizziness, like the top of your head has floated off and your brain is turning and sizzling like butter in a skillet. After that, it’s smooth sailing. If you don’t give up and cross back over the border, the storm of feelings settles down. It never quite goes away till you leave the Cambio, but at least you can stand it. It’s a hell of a place, the Cambio. I guess I should’ve warned my men wh

